摘要
以吉林省汪清县林业局天然云冷杉针阔混交林为研究对象,选取4块具有代表性的1 hm^(2)方形固定样地分别设置0,6.29%,11.22%和21.21%4种采伐强度,测定了各采伐强度下枯落物的现存量,并采用室内浸水法对不同分解阶段枯落物持水能力(最大持水量、最大持水率、有效拦蓄量等)进行研究。结果表明:(1)4种采伐强度的枯落物总现存量为29.04~35.26 t/hm^(2)。(2)随采伐强度增加,新鲜层和完全分解层枯落物最大持水量和有效拦蓄量均呈现先降低再增加随后又降低的规律,而半分解层枯落物则表现为先增加再降低随后又增加的趋势。(3)采伐强度对枯落物的持水能力无显著影响,而分解阶段对其影响极显著;双因素方差分析表明,采伐强度和分解阶段的交互作用对枯落物持水性能影响显著。(4)回归拟合分析表明,在枯落物持水达到饱和状态前,不同采伐强度下各分解阶段枯落物的持水量、持水率与浸泡时间存在对数函数关系,吸水速率与浸泡时间存在幂函数关系。因此,适度的采伐不会对枯落物的持水性能产生显著的负面影响,分解阶段则是影响云冷杉针阔混交林枯落物持水性能的重要因素,而二者的交互作用能够显著影响枯落物的持水性能。
The natural spruce-fir coniferous and broad-leaved mixed forests in Wangqing Forestry Bureau of Jilin Province were taken as the research object,and four representative square fixed plots of 1 hm^(2) were set up with a cutting intensity of 0,6.29%,11.22%and 21.21%.The standing crop of litter under various cutting intensities was measured,and the water holding capacity(maximum water holding capacity,maximum water holding rate,effective retention capacity,etc.)of litter at different decomposition stages was studied using an indoor immersion method.The results showed that:(1)The total standing crop of litter in the four cutting intensities was between 29.04 and 35.26 t/hm^(2).(2)With the increase of cutting intensities,the maximum water holding capacity and effective interception capacity of litter in the fresh horizon and complete decomposed horizon decreased first,then increased and decreased again,whereas the opposite trend was found for the litter in the semi-decomposed horizon.(3)The cutting intensity had no significant effect on the water holding capacity of litter,but the decomposition stage had a significant impact on it.The two-way analysis of variance showed that the interaction between the cutting intensity and the decomposition stage had a significant influence on the water holding capacity of litter.(4)The regression fitting indicated that there was a logarithmic function relationship between the water holding capacity,water holding rate and immersion time of litter in each decomposition stage under different cutting intensities,and there was a power function relationship between water absorption rate and immersion time before the litter reached the saturation state.Therefore,moderate cutting would not have a significant negative impact on the water holding capacity of the litter,the decomposition stage was an important factor affecting the water holding capacity of the litter in the spruce-fir coniferous and broad-leaved mixed forest,and the interaction of decomposition stage and cutting intensity coul
作者
杜雪
王海燕
耿琦
毛建国
王一格
DU Xue;WANG Haiyan;GENG Qi;MAO Jianguo;WANG Yige(College of Forestry,Beijing Forestry University,Beijing 100083;Wangqing Forestry Bureau of Jilin Province,Wangqing,Jilin 133200)
出处
《水土保持学报》
CSCD
北大核心
2021年第2期361-368,共8页
Journal of Soil and Water Conservation
基金
国家重点研发计划重点专项(2017YFC0504002)。
关键词
枯落物
持水特性
云冷杉针阔混交林
采伐强度
litter
water holding characteristics
spruce-fir coniferous and broad-leaved mixed forest
cutting intensity
