本文選題：氮沉降 + 降雨��； 參考：《生態(tài)學(xué)報》2017年02期

【摘要】：從2013年11月至2015年5月,采用凋落物分解袋法,設(shè)置了對照(CK)、氮沉降(N)、減雨(R)、增雨(A)、氮沉降+減雨(NR)、氮沉降+增雨(NA)6個處理水平,研究了模擬氮沉降和降雨對華西雨屏區(qū)常綠闊葉林凋落物分解的影響。結(jié)果表明:華西雨屏區(qū)常綠闊葉林凋落葉分解較快,凋落枝分解較慢;凋落物夏季分解較快,其他季節(jié)分解較慢。經(jīng)過18個月的分解后,凋落葉和枝的質(zhì)量殘留率分別為45.86%和86.67%,凋落葉分解50%需要的時間為1.42 a,比枝短6.19 a。各處理凋落物葉分解系數(shù)表現(xiàn)為:k(A)k(CK)k(NA)k(N)k(R)k(NR),凋落枝質(zhì)量殘留率表現(xiàn)為:NNRRNACKA。模擬氮沉降、減雨和增雨處理凋落葉分解50%分別需要1.79、1.94a和1.36a,凋落枝分解50%分別需要8.84、8.63 a和6.47 a。各處理凋落葉分解95%需要5.37—11.33 a,凋落枝分解95%需要27.41—33.84 a。同一氮沉降條件下,增雨處理促進(jìn)凋落葉分解,減雨處理抑制凋落葉分解;同一降雨條件下,氮沉降抑制凋落葉分解。氮沉降或降雨對凋落物的分解產(chǎn)生顯著影響(P0.05),其交互作用影響不顯著(P0.05)�？梢�,在氮沉降持續(xù)增加和降雨格局改變的背景下,增雨促進(jìn)了華西雨屏區(qū)天然常綠闊葉林凋落物的分解,氮沉降和減雨抑制了凋落物的分解,模擬氮沉降和降雨對凋落物的分解交互作用表現(xiàn)不明顯。
[Abstract]:From November 2013 to May 2015, using litter decomposition bag method, six treatment levels were set up: CK, N deposition, RN, RN, An, NRN and NAA. The effects of simulated nitrogen deposition and rainfall on litter decomposition of evergreen broadleaved forest were studied. The results showed that the litter decomposition of evergreen broad-leaved forest was faster and the decomposition of litter branches was slower, and the decomposition of litter was faster in summer and slower in other seasons. After 18 months of decomposition, the mass residue rates of leaves and branches were 45.86% and 86.67, respectively, and the time required for decomposition of 50% leaves was 1.42 a, 6.19 a shorter than that of branches. The leaf decomposition coefficients of each treatment were as follows: 1 / KG AK ~ (1) K ~ (+) K ~ (1) NK ~ (+) ~ (1) NK ~ (+) ~ (1) ~ (1) NK ~ (+) ~ (1) N ~ (+) K ~ (+) ~ (1) ~ (1) ~ (1)? Simulated nitrogen deposition, rain abatement and rain increasing treatments required 1.79 ~ 1.94 a and 1.36 a for leaf decomposition, respectively, and 8.84 ~ 8.63 a and 6.47 a for 50% branch decomposition, respectively. The decomposition of leaves and branches needed 5.37-11.33a and 27.41-33.84a respectively. Under the condition of the same nitrogen deposition, the precipitation treatment promoted the decomposition of the litter leaves, while the precipitation treatment inhibited the decomposition of the fallen leaves, while under the same rainfall condition, the nitrogen deposition inhibited the decomposition of the litter leaves. Nitrogen deposition or rainfall had a significant effect on the decomposition of litter, but the interaction of nitrogen deposition or rainfall on litter decomposition was not significant. It can be seen that under the background of the continuous increase of nitrogen deposition and the change of rainfall pattern, the precipitation of natural evergreen broad-leaved forest litter is promoted, and nitrogen deposition and rain abatement inhibit the decomposition of litter. The interaction of simulated nitrogen deposition and rainfall on litter decomposition was not obvious.
【作者單位】： 四川農(nóng)業(yè)大學(xué)林學(xué)院四川省林業(yè)生態(tài)工程省級重點實驗室;
【基金】：國家“十二五”科技支撐資助項目(2010BACO1A11) 國家自然科學(xué)基金資助項目(31300522)
【分類號】：S714

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