藏北高寒草地地下生物量特征及其与土壤水分的关系

发布时间：2018-06-06 07:26

本文选题：高寒草地 + 地下生物量　；参考：《生态环境学报》2016年02期

【摘要】：植物地下生物量是高寒生态系统重要的碳库,可以反映植物对极端环境的适应特征。以高寒草原、高寒草甸草原和高寒草甸3种主要草地类型为对象,对比分析了非生长季和生长季的地下生物量,探究不同类型的高寒草地地下生物量分配机制及其动态变化过程。结果表明:(1)3种草地地下生物量的空间分布在生长季和非生长季均呈现"T"字型分布。在这两个时期,3种草地0~10 cm的生物量占总地下生物量的比例均表现为:高寒草原(91.20%,94.72%)高寒草甸草原(83.17%,92.07%)高寒草甸(67.04%,68.38%),且其比例在生长季均有增加;(2)两个时期高寒草甸地下生物量均最高(1 620.39±71.09)g·m~(-2),(3 950.08±291.46)g·m~(-2),非生长季高寒草原最低(136.24±9.14)g·m~(-2),生长季高寒草甸草原最低(133.97±6.93)g·m~(-2);高寒草甸和高寒草原地下生物量在生长季都有显著增加,而高寒草甸草原显著减少;(3)地下生物量与土壤含水量有显著的正相关关系,在同样的温度条件下,土壤含水量是地下生物量的重要影响因子;而生长季是藏北地区降水比较集中的时期,土壤表层水分的增加促使根系向表层生长。
[Abstract]:Plant underground biomass is an important carbon pool in alpine ecosystem, which can reflect the adaptation characteristics of plants to extreme environments. Taking the three main grassland types of alpine grassland, alpine meadow and alpine meadow as objects, the underground biomass of non-growing season and growing season were compared and analyzed. To explore the mechanism and dynamic process of underground biomass allocation in different types of alpine grassland. The results showed that the spatial distribution of below-ground biomass in the growth season and non-growth season of the three species showed "T" shape distribution. In these two periods, the biomass of 0 ~ (10 cm) of three kinds of grassland in these two periods are: alpine grassland 91.20 ~ 94.72) alpine meadow grassland 83.17 ~ 92.07) Alpine meadow 67.04 ~ 68.38cm, and its proportion increased in growth season and alpine meadow land in two periods. The highest biomass under the alpine meadow was 1 620.39 卤71.09 g / m ~ (-1) ~ (-1) ~ (-2) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1), (1 620.39 卤71.09) g 路m ~ (2) 路m ~ (-2), 3 950.08 卤291.46 g 路m ~ (2) ~ (2), 136.24 卤9.14 g 路m ~ (2) ~ (2) N and 133.97 卤6.93 g 路m ~ (2 However, there was a significant positive correlation between underground biomass and soil water content in alpine meadow steppe. Soil water content was an important influencing factor of underground biomass under the same temperature. The growing season is a period of concentrated precipitation in northern Tibet, and the increase of soil surface water promotes the root system to grow to the surface layer.
【作者单位】：中国科学院水利部成都山地灾害与环境研究所山地表生过程与生态调控重点实验室;中国科学院大学;
【基金】：中国科学院战略性先导科技专项(XDB03030505;XDA05050506) 国家自然科学基金项目(41201053)
【分类号】：S812

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