本文選題：高寒草甸 + 高原早熟禾　； 參考：《生態(tài)學(xué)報》2016年12期

【摘要】：植物對放牧的響應(yīng)是植物在響應(yīng)過程中為生存和繁殖所形成的適應(yīng)策略,研究植物表型反應(yīng)對揭示草原生態(tài)系統(tǒng)的放牧響應(yīng)機制具有重要意義。以青藏高原高寒草甸主要植物高原早熟禾(Poa alpigena)為研究對象,通過放牧和圍封試驗,研究其個體性狀對放牧與圍封的響應(yīng),旨在為草原生態(tài)系統(tǒng)放牧機制提供理論依據(jù)。結(jié)果表明:1)在長期放牧干擾下,除葉片數(shù)和根重外,其他性狀株高、分枝數(shù)、葉長、葉寬、葉面積、莖粗、莖長、根長、根粗、穗長、總?cè)~質(zhì)量、單葉質(zhì)量、莖重、穗重、全株重均出現(xiàn)顯著變小的特征(P0.05);而短期圍封對于高原早熟禾葉長、葉寬、總?cè)~質(zhì)量、單葉質(zhì)量、莖重、穗重、根重等功能性狀的恢復(fù)效果并不顯著(P0.05),表明放牧退化草原植物性狀具有保守性;2)通過構(gòu)建高原早熟禾性狀可塑性變化譜,發(fā)現(xiàn)穗重、莖重、全株重、分蘗數(shù)、莖長、株高等可塑性幅度較大,為放牧響應(yīng)的敏感指標(biāo),葉片數(shù)、葉寬、莖粗、根粗的可塑性變化幅度較小,為惰性性狀。
[Abstract]:Plant response to grazing is an adaptive strategy for survival and reproduction of plants. It is important to study the phenotypic response of plants in order to reveal the grazing response mechanism of grassland ecosystem. Poa alpigena, the main plant of alpine meadow in Qinghai-Xizang Plateau, was used to study the responses of individual traits to grazing and enclosure through grazing and enclosure experiments, in order to provide a theoretical basis for grazing mechanism of grassland ecosystem. The results showed that the plant height, branch number, leaf length, leaf width, leaf area, stem diameter, stem length, root diameter, ear length, total leaf mass, single leaf mass, stem weight, ear weight, stem length, leaf width, stem weight, ear weight, stem weight, The whole plant weight was significantly smaller (P 0.05), while the short term enclosure was used for the treatment of leaf length, leaf width, total leaf mass, single leaf mass, stem weight, ear weight, leaf length, leaf width, stem weight, ear weight, total leaf mass, single leaf weight, stem weight and ear weight. The restoration effect of functional traits such as root weight was not significant (P 0.05), which indicated that the plant traits of grazing degraded grassland were conservative. (2) by constructing the plastic variation spectrum of POA pratensis, it was found that ear weight, stem weight, whole plant weight, tiller number, stem length, ear weight, stem weight, total plant weight, tiller number and stem length were obtained. The plastic range of plant height is large, which is the sensitive index of grazing response. The number of leaves, leaf width, stem diameter and root diameter have a small range of plasticity, which is inert.
【作者單位】： 甘肅農(nóng)業(yè)大學(xué)草業(yè)學(xué)院草業(yè)生態(tài)系統(tǒng)教育部重點實驗室中-美草地畜牧業(yè)可持續(xù)發(fā)展研究中心;中國農(nóng)業(yè)科學(xué)院草原所;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)(2014CB138802) 國家科技支撐計劃課題(2012BAD13B07) 中央級公益科研院所基本科研業(yè)務(wù)專項項目資助(1610332015011)
【分類號】：S812

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