本文選題：種群年齡 + 葉性狀��； 參考：《草業(yè)學報》2017年01期

【摘要】：草食動物對植物種群結(jié)構(gòu)和功能的調(diào)控機制是放牧生態(tài)學研究的重要內(nèi)容。本研究以內(nèi)蒙古錫林郭勒盟蘇尼特右旗荒漠草原的長期放牧控制實驗為平臺,通過研究荒漠草原建群種短花針茅種群年齡動態(tài)與其相應葉性狀,以期揭示荒漠草地放牧調(diào)控下植物響應機制。結(jié)果顯示,1)短花針茅種群基徑小于4mm部分植株存活數(shù)少;適度放牧處理短花針茅各年齡階段頻度與不放牧基本一致,重度放牧處理齡級Ⅲ的頻度和比例分別下降了0.79,0.73;2)短花針茅種群齡級Ⅰ與齡級Ⅱ的短花針茅頻度和比例較高,齡級Ⅲ相對較低,屬于比較穩(wěn)定的種群;Godron指數(shù)顯示短花針茅年齡結(jié)構(gòu)的穩(wěn)定性重度放牧適度放牧不放牧;3)放牧調(diào)控下,葉高、葉長、葉干重、葉直立度、葉長寬比為年齡型敏感性狀,自然葉寬、完全葉寬、葉卷曲度、葉干物質(zhì)含量為年齡型保守性狀;4)相關(guān)分析認為自然葉寬和葉干物質(zhì)含量與各年齡型敏感性狀基本呈協(xié)同變化;葉卷曲度與葉干重負相關(guān)(P0.05),與葉直立度呈正相關(guān)(齡級Ⅲ、齡級Ⅰ)。研究認為,短花針茅種群在亞穩(wěn)定下,通過控制種群年齡及葉性狀,來完成其生活史對放牧調(diào)控的適應。
[Abstract]:The regulation mechanism of herbivores on plant population structure and function is an important part of grazing ecology. Based on the long-term grazing control of the desert steppe of Sunita Youqi in Xilin Guolle League, Inner Mongolia, the population age dynamics and leaf characters of Stipa breviflora in desert steppe were studied. In order to reveal the mechanism of plant response under grazing control in desert grassland. The results showed that the basal diameter of Stipa breviflora population was smaller than that of some 4mm plants, and the frequency of different age stages of moderate grazing treatment was basically the same as that of non-grazing. The frequency and proportion of age grade 鈪，

本文編號：1833259