However, salt can be formed as the dominant species of plant communities is not much, only a few types of communities constitute the formation of dominant vegetation on saline-alkali soil, most of halophytes in saline soil scattered halophytic plant communities or as a companion species appear in the local environment can be formed small communities, small area formed between the mosaic of vegetation communities in other complexes. With the degradation of grassland vegetation, increased soil salinity, halophytes gradually increased, the community gradually expanded and salt to form a large area of vegetation, or even a landscape lawn communities.
in high salinity habitats can grow and complete its life cycle of the plant halophytes. Halophyte halophytes have real (post-salt plants), salt-tolerant plants (halophytes and sexual) of the points, which is defined on both saline and non-saline growth and development of plants.
(a) true halophytes
true halophytes in the physiological and ecological characteristics of a certain salt, according to the adaptation of excess salts can be divided into true halophytes: Poly salt plants, salt excretion in salt plants and refuse plants. Salt plants which together accumulated a large number of their organization salt, salt excretion in excess of plant salt is secreted, but refused halophytes, then have a capacity of not absorb large amounts of salt.
1. Poly Plant
salt requirements of such plants have a strong salinization of soil genetic characteristics, only the necessary amount of salt in there under, it developed normally, grew well, they absorb large amounts of soil from salt ions stored in the body, not only will not be compromised protoplasts, and cells which had been increased osmotic pressure to ensure that the salt from the soil containing more than absorb the water, often succulent leaves. This accumulation of salt in the body called the poly plant salt plants. Mainly in the western Jilin Province and salsa are some plants of the genus Atriplex. These plants in the form of functional anatomy and physiology of salinity adaptation has some traits such as leaf angle salsa smaller, linear fleshy, covered with thick waxy cuticle on the crystal particles, these features is a good protection structures,Discount UGG boots, can reduce the excessive transpiration of water in the anatomical structure of leaves, leaf water storage is well developed, cells are stored salt, At the same time there is a large water storage within the mesophyll cells, to ensure that the water plants, leaf water content of 80% or more, which will help dissolve Na +. Vascular arrangement of the stem is not in a row, but two or scattered distribution, which will strengthen the horizontal transporting material, the material provides a reliable transport mechanism.
2. Salt excretion in plants
these salt and polymer plants, like salt plant, with an important mechanism to adapt to salt stress, their cell permeability for salts great difference between plants and salt together is that they can absorb a lot of salt ions, but not quite accumulate in the body, but by the stems and leaves dense glands on the surface of the body or similar organ, the excess will be absorbed by the salt ions from the body. Common salt excretion in plants is mainly Angeles Pinus. If Limonium in young leaves of the distribution of epidermal cells under the flower type of salt gland, the basal cell and the cap cells constitute the base of salt ions through the cell cap cells secrete salt from the body holes. Mature leaves of partial aging, they rely on the base of salt gland cells in cell disruption and the cap hole salt secretion secretion of salt. Some plants such as saltbush plants cells by epidermal blisters burst release hairy subsidiary of salt.
3. Resist salt plant
such halophytes and salt together plants secrete salt plants the contrary, they root for the salts through the cell is very small, although they can in saline soil, the growth of normal development, but almost no absorption of harmful salts contained in the soil. The osmotic role of organic matter by the body, such as organic acids, sugars, amino acids, adjusted and maintained. Therefore, the salt rejection of such plants as plants, common Puccinellia genus and the type of sagebrush.
(b) the ecological characteristics of halophytes
halophytes in the western plain of Jilin Province is widely distributed in the vast lowland plains are distributed on saline land, but most salt-resistant plants only slightly saline, only a few of the typical post-halophytes resistant to severe salt, alkali spot on the survival, and can form different types of salt vegetation. Ecological characteristics of halophytes in Table 2.4.1.
(c) The feeding value of halophytes
growth of saline-alkali soil in west Jilin province, more than 60 kinds of salt on plants, in addition to the two alkali buttercup Ranunculaceae and rattan baskets Mo Ke goose down, almost all of the forage plants. In particular, can form large communities in Leymus chinensis, and salinization of grassland in the region constitute the dominant vegetation, is one of our excellent natural grassland. Alkali in the light and the formation of plaque on the growth of Puccinellia tenuiflora community, Puccinellia, wild barley, Chloris virgata, teasel, also are excellent deer forage. These nutrient-rich plants (see Table 2.4.2), crude protein content of 14% or more, all livestock are eating,cheap UGG boots, are fine grass.
grassland vegetation growth and development
L. chinensis is a low, flat ground west plain of Jilin most representative types, the main plant has chinensis, Carex inch, Chloris virgata, sea grass milk, alkaline land dandelion, alkali onions and so on. Exist due to soil salinization potential, once the excessive use of L. chinensis community would be some resistance to trampling and the salinity of the plant, reflecting the degradation of L. chinensis, and constitutes more community types. Different communities and reflect the differences in the extent of soil alkalization, alkalization degree of light, such as L. chinensis - inch communities of Carex L. chinensis - wild barley communities; and L. chinensis - base Artemisia chinensis - Chloris virgata, chinensis - base onions, L. chinensis - Mao and other alkali soil alkalization reflects the degree of community strengthening; soil alkalization of the lot appeared serious alkali Kochia scoparia, salsa, salsa horn, deer hair, Puccinellia tenuiflora, North Korea Puccinellia, Chloris virgata, Iris, beach days,UGG boots clearance, alkali buttercup winter and round leaf salt and other such communities,UGG boots, which constitute the low-lying land west plain of Jilin vegetation.
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