不同土地利用方式下的生物量季节动态研究

Seasonal Dynamics of Biomass under Different Land Use Patterns

[目的]研究不同土地利用方式下的生物量季节动态。[方法]于2008年生长季(5～10月)期间,分别测量了针茅群落、羊草群落和农田3个不同地表覆盖状况下的植物地上生物量和地下生物量。[结果]地上生物量均在8月达到最高值,羊草、针茅和农田的地上生物量分别为287.91、117.05、193.59 g/m2;3个样地植物根系总生物量在7月最高,针茅、羊草和农田样地分别为1 683.9、1 601.9、513.9 g/m2;植物上层根系0～15 cm/植物下层根系15～30 cm的生物量比率最大的是羊草,针茅次之,农田最小。[结论]为生态脆弱地区的生态环境保护提供了理论依据。

[Objective] The aim was to study seasonal dynamics of biomass under different land use patterns.[Method] Aboveground biomass and underground biomass of plants under 3 different surface cover conditions of Stipa krylovii,Leymus chinensis and farmland were determined in growing season（from May to October） of 2008.[Result] The aboveground biomass of Stipa krylovii,Leymus chinensis and farmland in August all reached the highest value,which of Stipa krylovii,Leymus chinensis and farmland were 287.91,117.05 and 193.59 g/m2,respectively.The total biomass of plant roots of the 3 plots in July all reached the highest value,which of Stipa krylovii,Leymus chinensis and farmland were 1 683.9,1 601.9 and 513.9 g/m2,respectively.Leymus chinensis had the biggest biomass ratio of upper plant roots（0-15 cm） to lower plant roots（15-30 cm）,Stipa krylovii took second place,and farmland had the smallest one.[Conclusion] The research provides theoretical basis for the ecological environment protection of ecological fragile area.