CAJ | 학술논문

2009和2010年夏天沿藏北高原高寒草地样带调查了高寒草地生态系统(高寒草甸、高寒草原和荒漠草原)在围栏禁牧和自由放牧管理下的物种丰富度和多样性(Shannon-Wiener指数,Simpson优势度指数和Pielou均匀度指数).研究结果显示:自2006年起藏北高原围栏禁牧在植被类型和区域尺度上没有显著改变物种丰富度和多样性.物种丰富度和多样性主要受生长季降水驱动,超过87％的变异可由生长季降水来解释.物种丰富度和多样性在自由放牧和围栏禁牧2类样地对生长季降水的响应方式一致.物种丰富度随降水呈指数型增长关系,多样性指数则呈现正线性关系.研究结果预示藏北高原地区生长季降水的变化对于物种丰富度和多样性管理至关重要,在未来高寒草地保护研究中应予以重视.
2009화2010년하천연장북고원고한초지양대조사료고한초지생태계통(고한초전、고한초원화황막초원)재위란금목화자유방목관리하적물충봉부도화다양성(Shannon-Wiener지수,Simpson우세도지수화Pielou균균도지수).연구결과현시:자2006년기장북고원위란금목재식피류형화구역척도상몰유현저개변물충봉부도화다양성.물충봉부도화다양성주요수생장계강수구동,초과87％적변이가유생장계강수래해석.물충봉부도화다양성재자유방목화위란금목2류양지대생장계강수적향응방식일치.물충봉부도수강수정지수형증장관계,다양성지수칙정현정선성관계.연구결과예시장북고원지구생장계강수적변화대우물충봉부도화다양성관리지관중요,재미래고한초지보호연구중응여이중시.
Species richness and diversity indices (Shannon-Wiener index,Simpson dominance index and Pielou evenness index) in alpine grassland ecosystems (alpine meadow,alpine steppe and desert steppe)under grazing-excluded and freely grazed sites were investigated along the Northern Tibetan Plateau Alpine Grassland Transect during summer 2009 and 2010.We found that species richness and diversity have not been significantly altered by short-term grazing exclusion since 2006 at vegetation and regional scales,Species richness and diversity were mainly driven by growing season precipitation (GSP),which accounted for over 87 ％ of the total variation observed.Species richness and diversity at grazingexcluded and freely grazed sites appear to respond to growing season precipitation in parallel.Species richness exponentially increased with GSP while diversity indices showed positively linear relationships with GSP.This indicates that GSP on the Northern Tibetan Plateau is crucial in regulating species richness and diversity and should be taken into account in future studies on alpine grassland conservation.