生态学报2017，Vol.37Issue(20)：6753-6760,8.DOI:10.5846/stxb201608081628
不同强度疏伐改造对马尾松林分水源涵养功能时空格局的影响
Effects of different thinning intensities on temporal and spatial patterns of water conservation of Pinus massoniana
摘要
Abstract
This study aimed to understand the changes in spatial and temporal dynamics of water conservation in the process of stand improvement of Pinus massoniana,in order to improve the forest ecological service function.We analyzed the changes in stand water holding capacity between the control stand and improved stand using thinning intensities of approximately 20％,35％,and 50％,in a 22-year-old P.massoniana forest of the Youxi Forest Farm in Fujian Province.The results showed that forest water conservation by stand improvement significantly increased with time (P ＜ 0.05),and forest water conservation increased significantly with the increase in thinning intensity after 10 years.Water holding capacity of the soil layer accounted for 95.89％97.18％ of the stand water holding capacity.Water holding capacity of the 0-20cm and 20-40 cm soil layers was not significantly different between the control stand and improved stand during first five years of stand improvement (P ＞ 0.05);however,after 10 years of stand improvement,water holding capacity of both 0-20 cm and 20-40 cm soil layers of the improved stand was significantly higher than the control stand (P ＜ 0.05).Water holding capacity of the canopy,vegetation,and litter layers accounted for 2.82％ (45.64 t/hm2)-4.11％ (76.81 t/hm2) of the stand water holding capacity.In the canopy layer,water holding capacity of the improved stand was significantly higher than the control stand when stand improvement was ＞ 10 years (P ＜ 0.05);water holding capacity decreased with increasing thinning intensity.In contrast,in the vegetation layer,water holding capacity of the improved stand was significantly lower than that of the control stand when stand improvement was ＞5 years (P ＜ 0.05);water holding capacity decreased with increasing thinning intensity.In the litter layer,water holding capacity of the improved stand was significantly higher than that of the control stand when stand improvement was ＞ 5 years (P ＜ 0.05);water holding capacity increased with increasing thinning intensity.The water holding ratio of the canopy and litter layers increased significantly with time (P ＜ 0.05),but the water holding ratio of the vegetation layer decreased significantly with time in the improved stand (P ＜ 0.05).These results indicate that the stand water holding capacity changed dramatically in the early stage of the improved stand,and the water holding capacity decreased with increasing thinning intensity.Thus,the improved stand was more beneficial for water conservation over a longer period of time.关键词
马尾松/林分改造/疏伐强度/水源涵养/时空动态Key words
Pinus massoniana/stand improvement/thinning intensity/water conservation/spatial and temporal dynamics引用本文复制引用
陈绍栓,许建伟,吴载璋,陈彬,李晨燕..不同强度疏伐改造对马尾松林分水源涵养功能时空格局的影响[J].生态学报,2017,37(20):6753-6760,8.基金项目
福建省林业厅林业科研项目“马尾松细柄阿丁枫城镇景观林空间结构及生态功能研究”(闽林科[2010]4号) （闽林科[2010]4号）
三明市林地生产力综合评价(闽林科[2014]6号) （闽林科[2014]6号）
三明市林业局林业科技项目“高产脂马尾松特征和标准化采脂技术研究”(20154107) （20154107）
