Planting density of Chimonanthus chinensis

1. Qianchi has strong vitality and extensive management, but it is necessary to choose an environment with sufficient light and good ventilation. Open-field cultivation is mostly planted in the shallow water areas and wetlands of lakeside gardens in the park, and potted plants can be planted in the courtyard. Appropriate amount of rotten chicken manure or cake fertilizer should be applied to the cultivated soil.

2. From planting to closing, the plants were ploughed and weeded 3 or 4 times a year. Applying nitrogen fertilizer or compound fertilizer once in spring and summer, applying compost or stable manure once after autumn, and often keeping the soil moist is the most important measure to grow Chikuchi. Weeds and water moss should be removed in time during the growing period, and potassium dihydrogen phosphate should be applied two or three times before flowering and during flowering. Keeping the soil moist regularly can promote plant growth.

3. In late October, the aboveground part gradually withered, and the aboveground plants were cut off with branch shears, and the term of office naturally overwintered in the open field. Pot plants must be moved to a low-temperature cold shed to survive the winter, and the pot soil must be kept moist throughout winter, and the temperature should be controlled at 0 ℃ to 5 ℃, so as to avoid sprouting ahead of time in winter. It is usually planted once every two or three years. Glass, sprouted in about 20 days

Key points of Garden Conservation of Aquatic plants

Aquatic plants are a kind of plants that live in water or moist soil for a long time and can complete the reproductive cycle. A variety of leaves, colors, flower shapes and seeds of aquatic plants, they can show a variety of interest. According to the life form, it can be divided into:

Wet plants-Reed, reeds, calamus, variegated awn, pennisetum and so on.

Standing water plants-Acorus tatarinowii, starlight grass, Chiqingcai, lotus and so on.

Floating-leaf plants-Euryale, water lily, water poppy, king lotus, water poppy, cabbage and so on.

Floating plants-sophora leaf duckweed, water grass, sea cauliflower, big fish and so on.

Submerged plants-black algae, bitter grass, Rabdosia angustifolia, bamboo leaf and so on.

Key points for garden conservation of aquatic plants:

1. Adaptability of water depth

In addition to floating plants, the ecological factor that has the greatest impact on aquatic plants is the depth of water, which directly affects the survival of aquatic plants.

Wet plants, such as wild buckwheat, zebra grass, Reed and so on, can only be planted above normal water level.

There are many kinds of water-holding plants, and the adaptability to water depth is related to the plant height. The tall plant has a strong ability to adapt to the water depth, on the contrary, the ability is poor. But generally speaking, the depth of water cannot be greater than 60cm.

Floating-leaf plants are generally more adaptable to water depth than water-bearing plants. For example, the water lily is generally 0.8m, and the water depth of Euryale can reach 1.5m. Linnaeus is also a kind of very interesting plant. As a floating-leaf plant, its adaptability to water depth can reach 3m. When the plant grows to a certain extent, it can cut off its roots and become a floating plant, which is not limited by water depth.

The water depth adaptability of submerged plants is affected by the visibility of light and water. The better the visibility of the water, the stronger the light, the deeper the distribution of submerged plants. In general, submerged plants are planted at twice the depth of visibility.

2. Planting density

The design density of aquatic plants is based on the fact that all the aquatic plants cover the ground (water surface) after restoration, and the construction density is based on the tillering, branching characteristics, planting season and fertility of the planting soil. combined with the completion acceptance time and other factors to determine a planting density, construction density has practical value for saving construction cost.

3. Planting season

Most of the aquatic plants are herbaceous plants. In the growing period, especially in the high temperature season, the germination and growth rate of new shoots is very fast, the root activity is exuberant, and it is easy to recover. Generally, aquatic plants can germinate new roots after 1-2 days after root injury, and plant morphology can be effectively restored after 10-30 days after planting in the growing period.

Species with strong cold tolerance can be planted in the dormant period, such as onion, Zili flower, Reed, water lily, Reed bamboo, calamus, Qianqu vegetable and so on. The injured roots of these plants can withstand the test of long-term low temperature and have the physiological characteristics of resistance to low temperature.

Species with poor cold tolerance must be planted during the growing period, and this kind of plant is very easy to cause frost damage when it is planted during dormancy. Such as barracuda, flower and leaf onions, papyrus, parasol, Egyptian sedge, aquatic canna and so on. If this kind of plant is planted in the growing period, the root soil temperature is high, the root activity is exuberant, and the plant recovers quickly.

Low-temperature areas relative to plants must be planted during the growing period. For example, papyrus originating in tropical Africa and ginger flowers originating in South and Southwest China can only be planted in the growing period in Hangzhou and the north, otherwise they are vulnerable to death from freezing injury.

4. Normal water level

Many aquatic plants die in a large area after planting, and the important reason why they can not achieve the desired effect is the problem of water level control. It can be seen that the constant water mark is the lifeline of aquatic plants. In the actual construction operation, enough attention should be paid to the constant water level line. It is suggested that the normal water level should be determined by the level before setting out in the planting construction. In the plant configuration, the water depth adaptability of all kinds of plants is considered as a hard index.

5. Wave influence

The small water system generally has a small area and slow flow, which has little effect on the planting and growth of aquatic plants. Rivers and lakes and other water bodies bring great difficulties to the planting and survival of aquatic plants due to the rapid erosion of wind waves, boat waves or currents. According to the characteristics of waves, the corresponding technical measures of wave dissipation and bank revetment should be taken when planting. Pine piles and bamboo piles can be used for the shorelines of lakes and rivers where the lake surface is small and the waves are not big. They can not only dissipate the waves but also stabilize the bank, which is a better choice. Can also be used with the landscape combined with the shoreline stacked stone treatment, stacked stones are scattered, not only to meet the needs of the landscape, but also to eliminate waves and stabilize the bank. After the restoration of aquatic plants, aquatic plants can play a certain role in wave dissipation, and its root system can also play a certain role in slope protection and bank stabilization.

The problem of comprehensively promoting the application of wetland aquatic plants in ecological construction in recent years, with the comprehensive promotion of the construction of ecological provinces (cities and counties), wetland protection and constructed wetland construction projects have increased massively. Aquatic plant cultivation is often the key to the success or failure of these projects to give full play to ecological benefits and landscaping, but there are many problems in the application of aquatic plants. For example, the species name is confused, the seedlings have the wrong object, the specification does not accord with the seedling morphology and biological habits, the seedling density has a big gap with the actual needs, and so on. These problems seriously affected the landscaping function of aquatic plants, wasted a lot of money, and damaged the reputation of aquatic plants to a certain extent.

The confusion brought by the literal meaning.

Biological names have been confused for a long time. This problem was not solved gradually until the creation of double nomenclature by CarlvonLinnaeus (1707-1778) of Sweden in the 18th century. From the current application of aquatic plants in domestic gardens, this problem is still very prominent. For example, in a planting plan, yellow calamus, aquatic iris and yellow iris are used at the same time, in fact, these three plant names refer to the same plant, namely Irispseudacorus.

Literal meaning causes a lot of problems, and nothing is more obvious among aquatic plants than calamus. Acorus calamus is a plant of the genus Acorus in Araceae. Gladiolus is prefixed with "stone", "golden thread" and "money", all of which are hydrophytic plants of the genus Gladiolus in Araceae. However, the prefix "yellow" and "flower" of calamus belongs to Iris of Iridaceae. Although they are also aquatic plants, there is a great difference between them.

There is also Lythrumsalicaria, which is currently in circulation in the seedling market with two kinds of seedlings: White and safflower. Four species of Lythrum are distributed in China, and the flowers are all purplish red, of which one species is produced in Zhejiang Province. The so-called white-flowered Chiji in circulation in the market is a fake and is actually a root dish of Saxifragaceae.

Confusion in the concept of life form

According to their life form, aquatic plants are generally divided into five categories: hygrophytes, water-standing plants, floating-leaf plants, floating plants and submerged plants. Some plants have strong adaptability and can show different life forms in different water environments. For example, Phyllostachys pubescens and Artemisia angustifolia are both submerged plants, but they can also be hygrophytes, and such as Euphorbia angustifolia and Acorus calamus are not only hydrophilic plants, but also adapt to wet and mesophytic environment.

However, most plants lack such high ecological value. Some designers plant xerophytes in water, such as Stipa gracilis and wild buckwheat to a depth of 0.5 meters. Stipa gracilis is a xerophyte, while buckwheat is a hygrophyte, which likes to be wet but is not resistant to flooding.

Water depth adaptability

When using aquatic plants to make landscaping in wetlands, the depth of water is a problem that designers must consider.

We often see lotus flowers planted in a depth of less than 3 meters on the design drawings. In fact, the general water plants adapt to the water depth of less than 60 centimeters, individual plants are particularly tall up to 70 centimeters, such as water candles, water onions and so on. It should be pointed out here that the depth of water adapted by submerged plants is a more complex problem, in addition to plant species, but also need to consider the visibility of light and water. The relationship between them is that the stronger the visibility of water and the stronger the light, the deeper the distribution of submerged plants.

Specification problem

The seedling specifications of trees and shrubs are very clear, while the specifications of aquatic plants are varied. There are mainly plants, buds, clumps and so on. For example, there are 36 plants per square meter, and there are also 4 plants per square meter. Most of the aquatic plants are herbaceous, with tufted and scattered habits, and most of them are sword-shaped leaves, which are difficult to express with crown width, but those with non-sword-shaped leaves can be expressed with crown width. For example, not long ago, we can see the expression of 3 buds / plant, such as 3 buds / plant, 4 buds / plant of Typha angustifolia, etc., which are not appropriate.

In view of the above problems, it is suggested that the plant names should be compared with Chinese names and scientific names in the design documents, and bipolar labeling can be used. In addition, the opening hours of public green spaces dominated by aquatic plants, such as wetland parks and lakes, are suggested to be from June to October, when aquatic plants recover quickly and grow well. It can better reflect the landscape characteristics of aquatic plants.