在两种条件下油茶枯叶分解速率的初步研究

PRELIMINARY STUDIES ON THE LITTER DECOMPOSTTION RATES IN CAMELLIA OLEIFERA UNDER TWO DIFFERENT CONDITIONS

对油茶（Ｃａｍｅｌｌｉａｏｌｅｉｆｅｒａ）枯叶在油茶林下灌草丛内及土块下的分解速率的研究，表明两种状态下油茶枯叶分解过程的共同特点是：枯叶的失重最先是由可溶性糖、丹宁、粗脂肪的分解而引起，纤维素、木质素分解速率较慢；随枯叶分解时间延长，Ｃ／Ｎ比值不断地下降。差异是：土块下的油茶枯叶失重率大于灌草丛中的油茶枯叶失重率，土块下及灌草丛中的油茶枯叶失重率１８０ｄ时分别为２８．６８％和２１．７０％，５４５ｄ时分别为６１．２％和４９．９％，９１０ｄ时分别为７８，４％和６８．２％。得出土块下和灌草丛中油茶枯叶年腐解率分别为０．６０２ｇ（ｇ·ａ）和０．４５３ｙ／（ｇ·ａ）。

A preliminary study was carried out to determine the litter decomposition rate(LDR)inCamellia oleifera under two different conditions.i.e. inside brush-herbosa and under soilmasses,The results showed that the litter decomposition process in C. oleifera was commonlycharacterlzed by litter weight loss resulting firstly from the loss of soluble sugar,tannin andraw fat. A lower decomposition rate of cellulose and lignin, and continuous decrease of C/Nratio as the litter decomposition time got longer.The differences between the two treatmentswere observed as follows:The litter under soil mass had a higher decomposition rate than theone inside brush-herbosa.The LDRs under soil mass and inside brush-herbosa are 2 8.68%and 2 1. 70%respectively on the 180th day,61.2%and 49.9%respectively on the 545thday, 78.4%and 68.2%respectively on the 910th day. The annual decaying rates(ADR)es-timated by the exponential drecay model showed that the ADRs under soil mass and insidebrush-herbosa are 0. 602g/(g.a)and 0.453g/(g.a)respectively,the decompcosition rate oforganic matter is larger under soil mass than inside brush-herbosa。