摘要
分析高寒草甸植被生育期耗水量及植被生物量积累与气象因子的关系,结果表明植被生育期耗水量呈单峰型变化过程,7月耗水量最大。初期营养生长阶段的5月耗水量、植被生物量均较低,水分影响着植物的初期营养生长但不甚显著;植物旺盛生长的6～7月,耗水量高,而生物量波动明显,温度和水分均影响到生物量的提高,且水分是影响植被生长的关键因素;植物生长末期的8～9月,耗水量及植被阶段累积生物量均较低,水分条件充足,并非是植物生长的限制因素。海北高寒草甸地区植被年地上净初级生产量、地下净初级生产量、净初级生产量与植被耗水量关系不明显。而与相应的温度具有较显著的正相关关系。表明高寒草甸地区植被净初级生产量受温度条件限制的影响比水分条件更为明显。
Analysis on variation characteristics of vegetation water consumption and the influence of the meteorological factors on the vegetation biomass during growing season over the alpine meadow showed that the water consumption appeared as a shape of single peak type and its maximum value was present in July.In May,at the initial growth of plant,water consumption and biomass both were low and the water influenced on plant growth but not significantly;In June and July,at the vigorous growth of plant,water consumption was high,and the biomass varied yearly.Temperature and water could both influence on the increase of the biomass and water was the key factor.In August and September,at growth telophase,water consumption and accumulative biomass were low.Water was sufficient and not a limiting factor for the plant growth.In Haibei alpine meadow,there was no evident influence of plant water consumption on aboveground net primary production,belowground net primary production,and net primary production.However,the corresponding temperature variable correlated positively and significantly with primary production.The results indicated that the ecosystem plant net primary production in alpine meadow was limited by temperature more evidently than by water conditions.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2013年第9期176-181,共6页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(31070437)
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(XDA05050601
XDA05050404)
国家重点基础研究发展计划(973)项目(2010CB833501-01-13)资助
关键词
高寒草甸
植被生育期
耗水量
生物量
净初级生产量
Alpine meadow
vegetation growth stage
water consumption
biomass
net primary production
