WANG Hao,DANG Xiaohong,LIN Bo,et al.Decomposition Rate of Litter and Dynamic Change of Nutrients in Different Stands in Coal Mining Subsidence Area[J].Northern Horticulture,2022,(19):87-93.[doi:10.11937/bfyy.20220169]
采煤沉陷区不同林分枯落物分解速率及养分动态变化
- Title:
- Decomposition Rate of Litter and Dynamic Change of Nutrients in Different Stands in Coal Mining Subsidence Area
- 文献标志码:
- A
- 摘要:
- 以神府煤田李家塔煤矿风沙采煤沉陷区主要修复林种沙柳、小叶杨及沙柳-小叶杨混交林枯落物为试材，采用野外分解袋试验，研究了枯落物来源和土壤类型对枯落物分解速率以及枯落物元素释放规律的影响，以期为区域生态修复提供参考依据。结果表明：沙柳林枯落物k值在240 d处达到峰值0.180，混合枯落物的k值在180 d增加为0.125；小叶杨林枯落物k值在240 d处达到峰值0.124。在同一时间处理下，枯落物全氮含量表现为沙柳林＞混合枯落物＞小叶杨林；有机碳含量由高到低为沙柳林>混合枯落物>小叶杨林；沙柳枯落物全磷含量在60 d处达到峰值(0.979 g·kg-1)，C/N为57.86~75.18。即60 d>CK>120 d>180 d，在60 d达到最大值(78.88)，180 d达到最小值(57.86)；混合枯落物C/N为72.89~92.01，在120 d达到峰值；小叶杨枯落物在180 d达到最低值77.22。采煤沉陷区沙柳林枯落物具有更高的分解速率和回归土壤养分能力。
- Abstract:
- The litter samples of Salix psammophila，Populus simonii Carr and Salix psammophila-Populus simonii Carr mixed forest in the subsidence area of Lijiata coal mine in Shenfu Coalfield were collected and used as the materials in a field litter decomposition experiment with decomposition bags，the effects of litter sources and soil type on decomposition rate and dynamic characteristics of nutrient release of litter were investigated,in order to provide reference for regional ecological restoration.The results showed that the k value of Salix psammophila litter reached the peak of 0.180 at 240 days，and the k value of mixed litter increased to 0.125 at 180 days;k value of litter in Populus simonii Carr forest reached a peak of 0.124 at 240 days.At the same time，the total nitrogen content of litter was Salix psammophila forest>mixed litter>Populus simonii Carr forest.Organic carbon content from high to low was Salix psammophila forest>mixed litter>Populus simonii Carr forest.The total phosphorus content of Salix psammophila litter reached its peak at 60 days (0.979 g·kg-1)，and its C/N was 57.86-75.18.That was，60 days>CK>120 days>180 days，reaching the maximum value (78.88) in 60 days and the minimum value (57.86) in 180 days.The C/N ratio of mixed litter was 72.89-92.01，which reached the peak at 120 days.The litter of Populus simonii reached the lowest value of 77.22 in 180 days.The litter of Salix psammophila forest in coal mining subsidence area had higher decomposition rate and ability to return to soil nutrients，which provided reference for regional ecological restoration.
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备注/Memo
第一作者简介：王浩（1992-），男，硕士研究生，研究方向为水土保持与荒漠化防治。E-mail：540549467@qq.com.责任作者：党晓宏（1986-），男，博士，副教授，博士生导师，现主要从事荒漠化防治等研究工作。E-mail：dangxiaohong1986@126.com.基金项目：内蒙古自治区科技重大专项资助项目（zdzx2018058）。收稿日期：2022-01-13