文献类型：期刊文献

中文题名：土壤温度和水分含量对三峡库区马尾松林凋落物叶分解的影响

英文题名：Effects of Soil Temperature and Soil Water Content to Needle Litter Leaf Decomposition of Pinus massoniana Plantations in Three Gorges Reservoir Area

作者：葛晓改[1,2] 曾立雄[1] 黄志霖[1] 肖文发[1] 谭本旺[3] 周本智[2]

第一作者：葛晓改

机构：[1]中国林业科学研究院森林生态环境与保护研究所国家林业局森林生态环境重点实验室;[2]中国林业科学研究院亚热带林业研究所;[3]湖北省秭归县林业局

年份：2013

卷号：49

期号：9

起止页码：153-157

中文期刊名：林业科学

外文期刊名：Scientia Silvae Sinicae

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：林业公益性行业科研专项(201104008);"十二五"国家科技支撑计划项目(2011BAD38B04)

语种：中文

中文关键词：凋落物叶分解;土壤温度;土壤水分含量;基质质量;三峡库区

外文关键词：needle litter decomposition; soil temperature; soil water content; substrate quality; Three Gorges Reservoir Area

分类号：S718.5

摘要：采用凋落物袋法研究土壤温度和水分含量对不同立地条件下马尾松林凋落物叶分解的影响。结果表明：分解540天后，20，30和46年生林分凋落物叶干质量剩余率分别为63．57％，59．80％和65．50％，30年生林分与20，46年生林分差异显著；凋落物叶分解速率与土壤温度呈极显著二次函数关系（P〈0．01），与土壤水分含量呈线性关系但相关性不显著（P〉0．05），凋落物叶分解速率与土壤水分含量／土壤温度比值呈极显著三次函数关系（P〈0．01）；20，30和46年生林分土壤水分含量／土壤温度比值分别为0．91～14．99，0．49～4．57和0．63—11．25，且马尾松林土壤水分含量／土壤温度比值为0—4．0时凋落物叶分解相对较快，4．0～12．0时分解相对较慢。
Influences of the soil temperature and water content on the needle litter decomposition were quantified with different site conditions in Pinus massoniana plantations in Three Gorges Reservoir Area by using litter bags method. The results showed that litter needle mass remaining rate was 63.57 % , 59.80 % , and65.50 % after 540 d exposition in 20-, 30- ,and 46-year-old forest, respectively, and the litter decomposition rate in 30-year-old stand was significantly greater than that in the other two forests. There was a significant quadratic relationship between needle litter decomposition rate and soil temperature （P 〈 0.01 ） , but no significant linear relationship was found between the decomposition and soil mossture content （ P 〉 0. 05 ）. Furthermore, needle litter decomposition rate was significantly in a cubic function correlated with the ratio of soil moisture content to soil temperature （P 〈 0.01 ）. The ratio of soil water content to soil temperature was 0.91 - 14.99, 0.49 - 4.57, and 0.63 - 11.25 in 20-, 30-, and 46-year-olf forest, respectively. When the ratio was in a range of 0-4.0 the litters decomposed relatively fast, and with the ratio of 4.0-12.0 the decomposition was relatively slow. The initial substrate quality, including N content, C/N ratio , and C/P ratio, of the needle litter was significantly different in the three stands. The needle litter carbon content was higher in 20- and 46-year-old forest than in 30-year-old forest after 540 d exposition. Compared with 30-year-old stand, litter carbon release dynamic in 20-, 46-year- old stands had significantly higher temperature sensitivity. These results indicated that the indirect effect of soil temperature to needle litter decomposition rate was controlled by carbon release rate instead of the initial carbon content. Litters with fast carbon release, accompanied with fast needle litter decomposition, has lower temperature sensitivity, and vice versa.