本文選題：森林濕地 + 凋落葉��； 參考：《生態(tài)學(xué)報》2017年07期

【摘要】：凋落葉分解是控制森林濕地物質(zhì)循環(huán)的重要生態(tài)過程,是全球C、N等元素循環(huán)的重要一部分。以美國南卡羅來納州10種典型植物的凋落葉為研究對象,通過2a的分解實驗測定分解階段凋落葉的生物量殘留率、分解速率常數(shù)k和C、N殘留百分比,探討初始凋落葉化學(xué)性質(zhì)對分解速率常數(shù)k的影響。結(jié)果表明:(1)十種凋落葉生物量在兩年內(nèi)降解至初始的14.5%—66.2%,種間差異可達(dá)4倍以上;分解速率常數(shù)k在0.26—1.64a~(-1)之間,針葉分解速率闊葉分解速率;(2)分解速率常數(shù)k與初始凋落葉酸溶性組分(AS)極顯著正相關(guān)(P0.001),與初始C含量、酸不溶組分(AIF)和AIF/N比均顯著負(fù)相關(guān)(P0.05);(3)凋落葉C殘留百分比持續(xù)下降至10.2%—66.1%,而N殘留百分比因物種與分解階段不同呈現(xiàn)不同變化規(guī)律。結(jié)果表明,森林濕地中凋落葉初始C組分差異是其分解速率的種間極大差異的主要原因,評估森林濕地的C、N循環(huán)應(yīng)充分考慮種間差異。
[Abstract]:Leaf litter decomposition is an important ecological process to control the material cycle in forest wetlands and is an important part of the global cycling of elements such as Con. The litter leaves of 10 typical plants in South Carolina, USA were studied. The biomass residue rate, the decomposition rate constant k and the residual percentage of Con N were determined by 2a decomposition experiment. The effect of chemical properties of initial litter on the decomposition rate constant k was studied. The results showed that the biomass of 10 littered leaves degraded to the initial 14.5-66.2 in two years, and the interspecific difference was more than 4 times, and the decomposition rate constant k was 0.26-1.64a ~ (-1). The decomposition rate constant k was positively correlated with the initial folic acid soluble component (ASS) and the initial C content. The percentage of C residue in littered leaves decreased to 10.2-66.1%, while the percentage of N residues varied from species to decomposition stage. The results showed that the difference of initial C component of litter leaves in forest wetland was the main reason for the great difference of decomposition rate among species, and to evaluate the Con N cycle of forest wetland, the difference between species should be fully taken into account.
【作者單位】： 北京大學(xué)深圳研究生院;北京大學(xué)城市與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(31321061)
【分類號】：S714
，

本文編號：1801115