Variation characteristics of vegetation characteristics, biological crusts and soil nutrients under the main vegetation configuration modes in the process of sand control in the Yarlung Zangbo River valley
LIU Lin1,2,3, ZHANG Bao-jun1,2, XIONG Dong-hong1,2, TANG Yong-fa1,2,4, YUAN Yong1,2,3
1. Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu 610041, China; 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 3. University of the Chinese Academy of Sciences, Beijing 100049, China; 4. Sichuan Agricultural University, Ya'an 625014, China
Abstract:In order to understand the impact of ecological project for sand control on the vegetation, biological crusts and soil characteristics of the middle reaches of the Yarlung Zangbo River valley. The characteristics of understory vegetation, surface biological crusts, and soil fertility properties during the implementation of the project with different vegetation configuration modes and ages were analyzed. 4 modes which restoration ages were approximately 10 years were selected, including Populus+Sophora moorcroftiana (YS+SSH), Sophora moorcroftiana (SSH), Hedysarum scoparium (HB) and Artemisia wellbyi (ZSH). Because of the most widely implemented of YS+SSH and SSH, three ages were studied (i.e. 6, 10 and 30 years old). The results showed that:The arbor+shrub (YS+SSH) and shrub (SSH and HB) plots with 10 years were more conducive to increasing species diversity than the herb (ZSH). The above-ground biomass, litter volume, underground biomass, soil organic matter, total nitrogen and total phosphorus content of the YS+SSH plot were significantly higher than the other three plots. The biological crusts of the ZSH plot were the most developed, followed by the HB plots, and the YS+SSH plot had no crust. The species diversity index, litter storage, underground biomass, soil organic matter, total nitrogen and total phosphorus content of the YS+SSH plot increased with the increase of years, but the biological crust was only in 6 years. The aboveground biomass, underground biomass, and biological crusts of the SSH plot gradually increased with the increasing of years, but the species diversity index and total nitrogen content showed a downward trend. The litter storage, organic carbon and total nitrogen content increased first and then decreased. Among the different modes, the YS+SSH plot had the best comprehensive near-surface characteristics. With the increasing of the project years, it had stronger effects on promoting the succession of vegetation on the sandy land in this area, increasing the productivity of the vegetation, and enhancing the fertility of the sandy land. Therefore, it is suggested that the vegetation configuration mode of arbor+shrub(YS+SSH) should be promoted in the ecological project for sand control in this area.
刘琳, 张宝军, 熊东红, 唐永发, 袁勇. 雅江河谷防沙治沙工程近地表特性——林下植被特性、生物结皮及土壤养分变化特征[J]. 中国环境科学, 2021, 41(9): 4310-4319.
LIU Lin, ZHANG Bao-jun, XIONG Dong-hong, TANG Yong-fa, YUAN Yong. Variation characteristics of vegetation characteristics, biological crusts and soil nutrients under the main vegetation configuration modes in the process of sand control in the Yarlung Zangbo River valley. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4310-4319.
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