本文選題：糞斑　切入點：禾草/雜類草斑塊　出處：《草業(yè)學報》2017年03期 　論文類型：期刊論文

【摘要】：植物群落構(gòu)成和種間關(guān)聯(lián),反映物種在空間上的分布及相互依存和制約關(guān)系。為探究牦牛糞沉積和植被斑塊互作下草地植物群落演變趨勢及穩(wěn)定性機制,以青藏高原東北緣高寒草甸禾草/雜類草斑塊和嵩草/雜類草斑塊為對象,分析牦牛糞沉積下兩種斑塊中主要植物種的重要值(IV)、Jaccard種間關(guān)聯(lián)指數(shù)和Spearman秩相關(guān)系數(shù)的變化規(guī)律。結(jié)果表明,1)糞沉積使禾草/雜類草斑塊的建群種扁穗冰草的IV增加和西北針茅的IV降低,嵩草/雜類草斑塊的建群種線葉嵩草的IV降低;2)禾草/雜類草斑塊中,糞沉積(DP)和對照(CK)的正負關(guān)聯(lián)種對比為0.61和0.63,顯著聯(lián)結(jié)種對為6.6%和6.4%;嵩草/雜類草斑塊中,DP和CK的正負關(guān)聯(lián)種對比為0.90和0.72,顯著聯(lián)結(jié)種對為2.8%和14.5%;且二者顯著聯(lián)結(jié)的種對多存在于優(yōu)勢種或亞優(yōu)勢種與伴生種之間;3)兩種斑塊中多數(shù)種對間聯(lián)結(jié)性弱,群落處于不穩(wěn)定階段;糞沉積使嵩草/雜類草斑塊的穩(wěn)定性增強,利于禾草/雜類草斑塊的演變;4)依據(jù)優(yōu)勢種對環(huán)境的適應(yīng)方式和主導生態(tài)因子,將兩種斑塊的群落植物種劃分為喜陽耐旱植物、喜陰喜濕植物和喜陽喜濕植物三大生態(tài)種組。
[Abstract]:The composition and interspecific association of plant communities reflect the spatial distribution, interdependence and restriction of species. In order to explore the evolution trend and stability mechanism of grassland plant communities under the interaction of yak dung deposition and vegetation patches, Grass / forage patches and Kobresia / miscellaneous grass patches in alpine meadow in northeast margin of Qinghai-Tibet Plateau were studied. This paper analyses the important value of main plant species in two patches under dung deposition of yak. The variation rule of Jaccard interspecific correlation index and Spearman rank correlation coefficient are analyzed. The results show that fecal deposition can increase the IV of grass / hybrid grass patches. The IV of Festuca chinensis in Canada and the Northwest decreased, In the patches of Kobresia humilis / heterophyllodes, the species species IV of Kobresia humilis decreased by 2%) in the patches of grasses / hybrids. The positive and negative correlation species were 0. 61 and 0. 63, significantly associated species were 6.6% and 6. 4, the positive and negative correlations of DP and CK were 0. 90 and 0. 72, significantly associated species were 2.8% and 14. 5 in Kobresia / heterophylla patches, respectively. Most of the species pairs were found between dominant species or subdominant species and associated species, and most of them were weakly related to each other in the two patches. The stability of Kobresia humilis / heterophylla patches was enhanced by fecal deposition, which was beneficial to the evolution of grass / forage patches, and was based on the adaptation of dominant species to the environment and the dominant ecological factors. The community plant species of the two patches were divided into three ecological groups: Xiyang drought-tolerant plants, hygrophilic plants and hygroscopic plants.
【作者單位】： 草地農(nóng)業(yè)生態(tài)系統(tǒng)國家重點實驗室蘭州大學草地農(nóng)業(yè)科技學院;
【基金】：國家重點研發(fā)計劃課題(2016YFC0501902) 草地農(nóng)業(yè)生態(tài)系統(tǒng)國家重點實驗室2015年度開放課題 云南省高端科技人才引進項目(2012HA012)資助
【分類號】：S812

【相似文獻】

相關(guān)期刊論文 前10條

1 李慧勇;李慧卿;李清河;劉建鋒;江澤平;;幾種人工固沙林多種群多尺度格局及種間關(guān)聯(lián)[J];應(yīng)用生態(tài)學報;2008年04期

2 李育中;三種類型草地植物種間關(guān)聯(lián)的測定與比較[J];生態(tài)學雜志;1991年06期

3 李建豐,田明義,古德就,孫江華;葛藤主要節(jié)肢動物類群種間關(guān)聯(lián)的研究[J];華南農(nóng)業(yè)大學學報;2004年02期

4 郭W汌，

本文編號：1642563