人工草地建植对昭苏盆地山地草甸碳水通量特征的影响

发布时间：2019-03-28 15:36

【摘要】：2014年4~10月采用静态箱法对新疆昭苏盆地围封3年的人工草地(LG)和天然草地(NG)的生物量、CO_2净生态系统交换量(NEE)、蒸散量(ET)、生态系统呼吸(ER)进行了观测,结果表明:(1)退化山地草甸翻耕重建能有效提高草地的地上生物量。(2)NG年平均NEE要小于LG,全年平均蒸散量NGLG。NG的碳、水(NEE和ET)之间存在极显著相关关系(P0.01),而LG相关性不显著。(3)两种草地的NEE与大气温度、土壤温度和土壤含水量之间呈线性负相关关系,与空气湿度呈线性正相关关系,其中LG和NG的NEE与土壤含水量的线性关系均达显著水平。指数模型能够较好地模拟ER对土壤温度变化的响应,天然草地ER的温度敏感系数(Q10值)大于人工草地。天然草地翻耕重建成人工草地,草地CO_2净生态系统交换量虽有所升高,但蒸散量降低且同时降低了对温度变化的敏感性,提高了水分利用效率和草地生产力。
[Abstract]:The biomass of artificial grassland (LG) and natural grassland (NG), and the (NEE), evapotranspiration of CO_2 net ecosystem exchange in Zhaosu Basin, Xinjiang, for 3 years were measured by static box method from April to October, 2014. The results showed that: (1) the aboveground biomass of degraded mountain meadow could be increased effectively by ploughing and rebuilding; (2) the annual average NEE of NG was less than that of NGLG.NG of LG,; (2) the annual average NEE of NG was less than that of NGLG.NG of LG,. There was a significant correlation between water (NEE and ET) and LG (P0.01). (3) there was a negative linear correlation between NEE and atmospheric temperature, soil temperature and soil water content. There was a linear positive correlation between LG and NG, and the linear relationship between NEE and soil moisture content was significant. The exponential model can well simulate the response of ER to soil temperature change. The temperature sensitivity coefficient (Q10) of natural grassland ER is higher than that of artificial grassland. The CO_2 net ecosystem exchange capacity of natural grassland was increased, but the evapotranspiration decreased and the sensitivity to temperature change was decreased. The water use efficiency and grassland productivity were improved.
【作者单位】：新疆农业大学草业与环境科学学院/新疆维吾尔自治区草地资源与生态重点实验室;
【基金】：中国科学院战略性先导科技专项“应对气候变化的碳收支认证及相关问题”(XDA05050405) 农业部项目“国家牧草现代产业技术体系”(CARS35) 国家自然科学基金项目(31460636)
【分类号】：S812

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