Response of Grassland Biomass to Soil Moisture in the Arid Mountainous Area of the Qilian Mountains
Response of Grassland Biomass to Soil Moisture in the Arid Mountainous Area of the Qilian Mountains作者机构：Academy of Water Resources Conservation Forest of Qilian Mountains of Gansu Province Zhangye Gansu 734000 China Northwest Research Institute of Mining and Metallurgy Baiying Gansu 730900 China
出 版 物：《Journal of Landscape Research》 (景观研究（英文版）)
年 卷 期：2018年第10卷第1期
页 面：77-82页
学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程]
基 金：Sponsored by National Natural Science Foundation of China(91425301 31360201 91225302)
主 题：Mountain grassland Biomass Soil moisture Qilian Mountains
摘 要：The Pailugou watershed of the Qilian Mountains in the arid region of northeast China was selected for research to analyze the species, height, and biomass in typical mountain grassland with an altitude of 2,700–3,000 m and measure soil moisture, so as to explore the seasonal characteristics of grassland biomass as altitude increases and the relationship between grassland biomass and soil moisture. The results showed that:(1) with a mean value of 135.36 g/m^2, grassland aboveground biomass showed a unimodal distribution from rise to decline as altitude increased, and reached its maximum of 176.79 ± 28.37 g/m^2 at an altitude of 2,900 m; with a mean value of 946.13 g/m^2, grassland underground biomass showed an uptrend as altitude increased, and reached its maximum of 1,301.19 ± 68.24 g/m^2 at an altitude of 3,000 m;(2) the difference between aboveground biomass and underground biomass in the grassland at different altitudes was significant;(3) values of root shoot ratio of the arid mountain grassland varied between 4.14–11.95;(4) values of soil moisture content of the arid mountain grassland varied between 9.23%–31.31%;(5) there was a positive correlation between aboveground biomass and underground biomass and the mean soil moisture content(p 0.05), with a correlation coefficient of 0.778 4 and 0.784 3 respectively, soil layers with different moisture content made different contributions to grassland biomass, and moisture content in the soil layer where over-60-cm root systems were located was of significance to grassland biomass.
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