CAJ | 학술논문

气候变化导致水热条件发生变化，从而引起土壤含水量改变，必然影响区域植物群落结构和功能。本研究以黄土高原半干旱区天然草地群落为研究对象，在较大空间尺度上根据随机设置样地法调查区域内典型地带性草地群落，研究黄土高原半干旱区土壤含水量的变化对草地群落的影响。结果表明，1）地上生物量、凋落物质量与土壤含水量呈显著正相关；地下生物量和总生物量与土壤含水量虽正相关但不显著；2）物种多样性和物种丰富度均随着土壤含水量的增加而增加；3）植物功能群受土壤水分的影响，表现为禾本科和豆科随着土壤含水量的增加而增加，而杂类草相反。总之，在半干旱区土壤水分是限制群落生产力和物种多样性的重要因子，而禾本科和豆科作为指示物种可以反映土壤的水分状况。土壤水分的变化可能是导致半干旱区天然草地群落演替的驱动力，草地退化可能与土壤含水量的改变有关。
기후변화도치수열조건발생변화，종이인기토양함수량개변，필연영향구역식물군락결구화공능。본연구이황토고원반간한구천연초지군락위연구대상，재교대공간척도상근거수궤설치양지법조사구역내전형지대성초지군락，연구황토고원반간한구토양함수량적변화대초지군락적영향。결과표명，1）지상생물량、조락물질량여토양함수량정현저정상관；지하생물량화총생물량여토양함수량수정상관단불현저；2）물충다양성화물충봉부도균수착토양함수량적증가이증가；3）식물공능군수토양수분적영향，표현위화본과화두과수착토양함수량적증가이증가，이잡류초상반。총지，재반간한구토양수분시한제군락생산력화물충다양성적중요인자，이화본과화두과작위지시물충가이반영토양적수분상황。토양수분적변화가능시도치반간한구천연초지군락연체적구동력，초지퇴화가능여토양함수량적개변유관。
Climate change has resulted in altered hydrothermal conditions and variation in soil moisture content which affects plant community structure and function on the Loess Plateau.The effect of soil water on the plant community in the semiarid natural grassland of the Loess Plateau was investigated using a large scale ran-domized design trial.Key results were:1 )Above-ground biomass and litter biomass were significantly posi-tively correlated with soil water content.2 )Plant diversity and species richness were significantly positively correlated with soil moisture.3)Plant functional groups were also affected by soil water content;both grass and legume species increased significantly with increase in soil water content,whereas forbs decreased signifi-cantly.It was concluded that soil moisture is one of the most important factors limiting community productivi-ty and plant species diversity.Additionally,grass species may be able to indicate or reflect soil moisture sta-tus.Soil moisture changes may be driving plant community succession in semi-arid grassland.