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Studies On Water Ecological Adaptability Of Dominant Desert Plants On The Eastern Alashan Western Erdos Area

Posted on:2009-05-19Degree:MasterType:Thesis
Country:ChinaCandidate:Q WangFull Text:PDF
GTID:2120360245487140Subject:Ecology
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Eastern Alashan Western Erdos deserts are located in the East part of the largest desert—Asia-Africa desert, which can be announced to the a very special desert region not only in China but also among the globe. In recent years, the ecological environment in these regions is worsening with vegetation degradation, and frequent sand storms, along with the economic development and resource exploitation. Through the studies of the Ecological Adaptive Mechanism of main constructive plants on water, demand amount and dependency of the plants in these regions, a deeper look into the mechanisms and process of degradation and recovery of desert ecology is achieved, which would surly contribute to the protection and recovery of these regions both theoretically and practically.Biological character of transpiration rate and water quantity of plants in the desert of District called Donglaershan and West Eerduosi was surveyed with the change of climate from May to Oct in 2007. The transpiration rate, character and dynamic trend of water quantity, area difference and sensibility to the precipitation were analyzed according to the soil conditions, leaf ecological types of the plants and so on. What's more, the ecological suitability to water is discussed and researched based on the former results. The main conclusion of the research is as follows:1 .Transpiration rate of Desert plant is generally lower than that of grassland plants, which shows a single or bimodal curve, and is jointly controlled by temperature and precipitation.2.The daily variation of desert plant water potential emerges as a U-shaped curve and shows obviously seasonal differences. In May, July and August, the species water potential goes down gradually, while in October stays stable as that in August though some may rise appreciably.3.Water potential of desert plants has obviously interspecific difference, while Reaumria soongorica,Potaninia mongolica,Zygophyllum xanthoxylon,Haloxylon ammodendron,Kalidium gracile etc have relatively stable water potential interspecific differences.4.Water potentials of different desert plants have different sensitivity of water, while water potential of Potaninia mongolica is more sensitive of water, while Reaumria soongorica and Reaumuria trigyna are the least.5.Through the analysis of leaf water potentials and transpiration rates of plants of different leaf ecological types, it is discovered that fleshy leaf plants in desert regions are more adaptive to arid situations, and next come leathery type and xerophytes type. Plants of fleshy and leathery leaves fall into the category of low water potential, drought and dehydration tolerant plants, while the plants xerophytes type fall into that of drought tolerance of dehydration postponement with high tissue water potential.
Keywords/Search Tags:dominant desert plant, water ecological adaptability, desert area, soil and leaf water potential
PDF Full Text Request
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