桂西北5种退耕还林林分枯落物的持水特性
Water-Holding Characteristics of Five Types of Forest Litters of Returning Farmland to Forest in Northwest Guangxi
宋飞 1吴立素 2申庆海 1庄嘉1
作者信息
- 1. 广西大学林学院，广西南宁530004
- 2. 广西生态工程职业技术学院，广西柳州545000
- 折叠
摘要
[目的]为桂西北石漠化地区退耕还林生态建设提供一定的理论依据。[方法]对桂西北5种退耕林分枯落物蓄积量与持水特性进行研究。[结果]5种林分林下枯落物总蓄积量大小依次为尾叶桉（11．59 t／hm2）、任豆（7．99 t／hm2）、核桃（7．71 t／hm2）、板栗（7．14 t／hm2）、香椿（3．70 t／hm2）；5种不同林分各分解层枯落物持水能力表现基本一致，从大到小均为香椿、板栗、任豆、尾叶桉、核桃，半分解层枯落物持水量大于未分解层；不同林分林下枯落物持水量随着时间增加而增加，半分解层在浸泡2h有较快上升，未分解层在浸泡4h明显上升，之后进入平稳阶段；不同林分枯落物吸水速率随着时间增加而减小，枯落物半分解层与未分解层吸水速率在浸泡2h内最快，2～8 h逐渐变小，8 h之后明显减缓；不同林分林下枯落物的有效拦蓄量大小为尾叶桉（36．89 t／hm2）、板栗（26．65 t／hm2）、任豆（23．19 t／hm2）、香椿（16．64 t／hm2）、核桃（15．36 t／hm2）。[结论]尾叶桉具有较大蓄积量和有效拦蓄量，今后在以涵养水源与水土保持为目标的森林经营中，可适当增加该树种的种植。
Abstract
Objective] To provide the theoretical basis for ecological construction of returning farmland to forest in rocky desert area of north-west Guangxi.[ Method] Stand volume and water-holding characteristics of five types of forest litters of returning farmland to forest were re-searched in northwest Guangxi.[ Result] Total stand volume of five types of forest litters were in the order of Eucalyptus urophylla (11.59 t/hm2 ) >Zenia insignis(7.99 t/hm2 ) >Juglans regia (7.71 t/hm2 ) >Castanea mollissima(7.14 t/hm2 ) >Toona sinensis(3.70 t/hm2 ) .Water holding capacities of five types of forest litters were basically consistent,which were in the order of Toona sinensis >Castanea mollissima >Zenia insignis >Eucalyptus urophylla >Juglans regia.The water-holding capacity of the semi-decomposed litter was greater than that of the undecomposed litter.Water-holding capacity of the forest litter increased with the time prolonged.Semi-decomposed litter in-creased rapidly at 2 h; and undecomposed litter enhanced greatly when soaked for 4 h,and then entered into stable stage.Water absorption rate of the forest litter decreased as time prolonged.In the first 2 h,both the water absorption rate of semi-decomposed and undecomposed litter were the fastest.In 2-8 h after soaking,the rate gradually decreased.The rate declined slowly after 8 h.The effective interception rate of dif-ferent forest litters were in the order of Eucalyptus urophylla(36.89 t/hm2 ) >Castanea mollissima(26.65 t/hm2 ) >Zenia insignis(23.19 t/hm2) >Toona sinensis (16.64 t/hm2) >Juglans regia (15.36 t/hm2).[Conclusion] Eucalyptus urophylla has relatively great stand volume and effective holding capacity.During the construction of water conservation and soil and water conservation in future,we should increase the planting of Eucalyptus urophylla.
关键词
退耕还林/林下枯落物/持水特性Key words
Returning farmland to forest/Forest litters/Water-holding characteristics引用本文复制引用
基金项目
广西壮族自治区林业厅资助项目(20120897)
出版年
2016
国家科技期刊平台
NSTL
维普
万方数据