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冰川冻土  2013 

高寒草甸植被生产量年际变化及水分利用率状况

DOI: 10.7522/j.issn.1000-0240.2013.0056, PP. 475-482

Keywords: 高寒草甸,植被耗水量,年际变化,植被生物现存量,植被净初级生产量,水分利用率

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Abstract:

分析了海北地区高寒草甸植被2001-2011年11a耗水量、生物现存量、净初级生产量、水分利用率及其相关性,结果表明植物生长期5-9月耗水量416.30mm,植被地上净初级生产量(ANPP)、地下净初级生产量(BNPP)以及总的净初级生产量(NPP=ANPP+BNPP)分别为393.07g·m-2、945.26g·m-2、1338.33g·m-2,BNPP与ANPP之比为2.404.8月底植被现存生物量达3422.92g·m-2,其中地上和地下现存量分别为411.07g·m-2、3011.85g·m-2,BNPP与ANPP之比高达7.327,说明植被现存量巨大,归还土壤碳能力强.NPP与5-9月植被耗水量相关性很差,但与5-9月平均气温具有显著的正相关关系,表明高寒草甸地区水分条件可满足植物生长的基本需求,而同期温度是影响NPP提高的重要因素.11a来BNPP、ANPP和NPP平均水分利用率分别为0.958g·m-2·mm-1、2.326g·m-2·mm-1和3.284g·m-2·mm-1,表明高寒草甸植被净初级生产具有较高的水分利用率.

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