發(fā)布時間：2018-06-29 19:29

  本文選題：凋落葉分解 + 溪流��； 參考：《生態(tài)學報》2017年09期

【摘要】：灰分是凋落葉的重要組成部分,其濃度直接關系到凋落葉的分解過程及有機組分的動態(tài)特征,且可能受生境和分解時期的影響,然而有關凋落葉分解過程中灰分動態(tài)的研究鮮有報道。采用凋落袋法,以岷江上游高寒森林4種代表性植物康定柳(Salix paraplesia)、高山杜鵑(Rhododendron lapponicum)、方枝柏(Sabina saltuaria)和四川紅杉(Larix mastersiana)凋落葉為研究對象,研究了高寒森林凋落葉在3種不同環(huán)境條件下(林下、溪流、河岸帶)分解過程中灰分的動態(tài)特征。結果表明,灰分量隨凋落葉的分解整體呈現(xiàn)降低的趨勢,且不同環(huán)境條件和不同物種之間存在明顯的差異。與之相反,經過兩年的分解,除溪流中康定柳凋落葉灰分濃度略有下降外(-0.99%),林下和河岸帶中康定柳凋落葉及其它物種凋落葉中灰分濃度在所有環(huán)境條件下均表現(xiàn)出了增加的趨勢(5.86%—72.15%)。凋落葉分解過程中灰分濃度變異量在不同分解時期存在明顯或顯著的差異,且受物種和環(huán)境因子的調控。這些結果表明,傳統(tǒng)上認為凋落葉分解過程中灰分濃度比較穩(wěn)定的觀點是不準確的,且以凋落葉分解過程中灰分濃度不變的前提下采用無灰分質量損失(ash free mass loss)而計算凋落葉質量損失的方法存在一定的不準確性。研究為認識凋落葉分解過程中灰分的動態(tài)特征及凋落葉質量損失的測定方法提供了一定的參考。
[Abstract]:Ash is an important component of litter, and its concentration is directly related to the decomposition process and the dynamic characteristics of organic components, and may be affected by habitat and decomposition period. However, there are few reports on ash dynamics during leaf decomposition. The litter bag method was used to study the withered leaves of four representative plants, Salix paraplesia), lapponicum), (Sabina saltuaria) and Sequoia chinensis (Larix mastersiana) in the upper reaches of Minjiang River. The dynamic characteristics of ash content in the decomposition process of leaf litter in alpine forest under three different environmental conditions (forest, stream, riparian zone) were studied. The results showed that the grey component decreased with the decomposition of litter leaves, and there were obvious differences among different environmental conditions and species. In contrast, after two years of decomposition, Except for the slight decrease of ash concentration (-0.99%) in the littered leaves in the stream, the ash concentration in the littered leaves and leaves of other species showed an increasing trend (5.86- 72.15%) in the understory and riparian zones. The variation of ash concentration was significantly different in different decomposition stages, and was regulated by species and environmental factors. These results suggest that the traditional view that ash concentration is more stable during leaf decomposition is inaccurate. There was some inaccuracy in calculating the weight loss of littered leaves by using (ash free mass loss) without ash loss under the premise of constant ash concentration during leaf litter decomposition. The study provides a reference for the understanding of the dynamic characteristics of ash content in the process of litter decomposition and the method for determining the mass loss of littered leaves.
【作者單位】： 四川農業(yè)大學生態(tài)林業(yè)研究所林業(yè)生態(tài)工程省級重點實驗室高山森林生態(tài)系統(tǒng)定位研究站;長江上游生態(tài)安全協(xié)同創(chuàng)新中心;四川師范大學生命科學學院;
【基金】：國家自然科學基金(31270498,31570445,31500358) 高等學校博士學科點專項科研基金(20135103110002)
【分類號】：S714
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本文編號：2083128