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《Acta Ecologica Sinica》 1992-04
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EFFECTS OF SOIL SALINIZATION AND NONCAPILLARY POROSITY ON THE BIOMASS FORMING AND ECOLOGICAL DOMINANCE OF LEYMUS CHINENSIS COMMUNITY

Yin Li-Juan Zhang Wei-Zheng Shi De-Cheng (Grassland Research Institute, Northeast Normal University, Changchun, 130024)  
The biomass forming law of Leymus chinensis community in salinized habitat and the effects of the soil salinization extent were explored by investigating the L. chinensis communities growing on the soil with different level of salinization, and continually monitoring at fixed sample plots, and then the relationship among soil salinization extent, noncapillary porosity the biomass and ecological dominace of the L. chinensis community were analysed. The results showed that no essential change appeared in salinized habitat for the biomass forming process of L. chinensis community during a whole growing season. The biomass of the community was increasing with as-shaped curve as the number of days increased after turning green. The mathematical relation between them both could be expressed by a modified logisticformula Y . The different salinizatiton extents of soil madesome changes of parameters in the formula. As the salinization of soil became serious, Ym (maximum increment of biomass allowed by environment) . and C (background biomass at the start, of turning green) became smaller,the number of days reaching the point of Y = Ym/2+ C tended to decrease.The dominance of L. chinensis community was decreasing with an inverse S-shaped curve as the natural logarithm of salinity was increasing, and was increasing with a S-shaped curve as the noncapillary analysis showed that the salinity and noncapillary porosity of soil were the all important factors affecting the dominance which, should not be neglected but the effect of salinity was greater than that of noncapillary porosity. A perfect result of regression and a mathematical space model of the threa factors were gained byusing a formula Y = .
【Fund】: 国家重大自然科学基金
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