CAJ | 학술논문

短花针茅荒漠草原建群种为短花针茅（Stipa breviflora），优势种为无芒隐子草（Cleistogenes songorica）和碱韭（Allium polyrrhizum），3个种群地上现存量之和可达群落现存量的60%~80%，其数量消长、时空变化及结构的位移均会引起群落的巨大波动。为明确3个植物种群占有空间资源的能力、相互关系及其受放牧影响的变化规律，以内蒙古苏尼特右旗赛汉塔拉镇1999年建立的荒漠草原教学科研基地建群种和优势种为研究对象，于2012年8月在围封区（CK）和自由放牧区（CG）按样带法和样地法进行取样，运用生态位宽度指数、生态位重叠指数及灰色关联度进行数据分析，结果如下。受放牧影响，短花针茅和碱韭主要通过大幅度调节生态位宽度来保证植物种群存活及其在群落中的地位和作用，变化幅度分别为0.429~0.813和0.235~0.828；而无芒隐子草生态位宽度变化不大（为0.556~0.761），其对放牧影响的耐受性较强。在生态位重叠方面，短花针茅与无芒隐子草受放牧影响后分别与其他两植物种群重叠程度增加，而碱韭植物种群表现相反；生态位重叠程度变化与种对间的竞争能力有关，也与种对间的亲和能力有关，且存在不对称性。
단화침모황막초원건군충위단화침모（Stipa breviflora），우세충위무망은자초（Cleistogenes songorica）화감구（Allium polyrrhizum），3개충군지상현존량지화가체군락현존량적60%~80%，기수량소장、시공변화급결구적위이균회인기군락적거대파동。위명학3개식물충군점유공간자원적능력、상호관계급기수방목영향적변화규률，이내몽고소니특우기새한탑랍진1999년건립적황막초원교학과연기지건군충화우세충위연구대상，우2012년8월재위봉구（CK）화자유방목구（CG）안양대법화양지법진행취양，운용생태위관도지수、생태위중첩지수급회색관련도진행수거분석，결과여하。수방목영향，단화침모화감구주요통과대폭도조절생태위관도래보증식물충군존활급기재군락중적지위화작용，변화폭도분별위0.429~0.813화0.235~0.828；이무망은자초생태위관도변화불대（위0.556~0.761），기대방목영향적내수성교강。재생태위중첩방면，단화침모여무망은자초수방목영향후분별여기타량식물충군중첩정도증가，이감구식물충군표현상반；생태위중첩정도변화여충대간적경쟁능력유관，야여충대간적친화능력유관，차존재불대칭성。
Stipa breviflorawas the constructive specie, andCleistogenes songoricaandAllium polyrrhizum were dominant species of Stipa breviflora desert steppe. Their aboveground present biomass reached to 60%~80% of the total biomass, of which quantities, time and space changes, and structure displacement causeed large fluctuations in communities. Niche breadth and niche overlap index were analyzed to make sure the capacity of resources consumption, the relationships and variation impacts by grazing in Stipa breviflora desert steppe in Inner Mongolia Saihantala research station,established in 1999. The samples were collected using the transect and plot method in contrast area (CK) and continuous grazing area (CG), in August 2012. The results were shown as follows. Stipa brevifloraandAllium polyrrhizum affected by grazingmainly adjusted niche width to ensure plant populations survival and status or roles in the community, and their variation range were 0.429 to 0.813 and 0.235 to 0.828, respectively.Cleistogenes songoricadid not change in niche width (0.556 to 0.761), and showed a strong resistance to grazing.Stipa breviflora and Cleistogenes songoricaincreased niche overlap extent with the other two populations due to grazing, whereasAllium polyrrhizum was the opposite. There was a relationship between niche overlap extent and populations competitive ability, and also linked with the populations affinity that exists asymmetry.