拉薩河流域沼澤濕地優(yōu)勢草本生態(tài)位及種間聯(lián)結(jié)分析

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doi：10.11733/j.issn.1007-0435.2025.08.026

關(guān)鍵詞：拉薩河流域；沼澤濕地；生態(tài)位；生態(tài)響應(yīng)；種間聯(lián)結(jié)中圖分類號：Q948.1 文獻標識碼：A 文章編號：1007-0435（2025）08-2666-11

Abstract：To reveal the distribution characteristics of ecological niches and interspecific associations of dominant species in the plant communities of marsh wetlands in Lhasa River Basin，in this study we employed the “Levins”method，“Pianka”method，variance ratio method （VR） ）， x2 test，association coefficient （AC） and Ochiai（OI） indexes to analyze 1O dominant herbaceous plant species in the plant communities of five typical marsh wetlands.The results showed that the dominant herbaceous plant communities in the study area were primarily composed of species with wide and medium ecological niches，and the degree of niche overlap among these species was relatively high.Among the five wetlands，there were diferences in the distribution and response rates of developing and declining species.The overallplant communities in the five wetlands exhibited negative associations，indicating intense competition among species. The x2 test and association coefficient 0 .AC） values revealed that 73.3% ， 55.6% ， 64.4% ， 66.7% ，and 60.0% of species pairs in the five wetlands displayed negative associations， respectively. The OI index indicated that the Tangga Wetland （C2） had the highest proportion of species pairs with OI?0.8 ， which suggested significant strong associations among species.Through interspecific association analysis，it was found that the plant communities in the marsh wetlands ofLhasa River Basin are in the early stages of succession，with unstable structures，providing important ecologi cal insights of wetland restoration and biodiversity conservation.

Key words：Lhasa River Basin; Everglade;Niche; Ecological response ; Interspecific association

濕地是指自然的或人工的、長久的或暫時的沼澤地、濕原、泥炭地或水域地帶，是陸地和水生生態(tài)系統(tǒng)之間的過渡帶。（剩余15973字）