摘要
[目的]明确矿区复垦地造林前后土壤碳库的变化及土壤养分对碳库的影响。[方法]以造林前的荒草地和造林后的新疆杨林地为研究对象,研究复垦地造林前后土壤无机碳库、活性有机碳库、慢性有机碳库、惰性有机碳库和养分的变化规律和相互关系以及各养分指标对碳库的贡献率差异。[结果]表明,除NN(硝态氮)外,造林后土壤养分和碳库各组分含量均有所上升。林地土壤TN(全氮)、AN(铵态氮)、TP(全磷)、AP(速效磷)、TK(全钾)和AK(速效钾)的含量相较于草地分别增加了29.27%、17.21%、23.08%、27.04%、51.18%和53.19%,而土壤NN含量下降了71.84%。造林后土壤SOC(有机碳)、POC(颗粒物有机碳)、NPOC(非颗粒物有机碳)、DIC(可溶性无机碳)、DOC(可溶性有机碳)、MBC(微生物量碳)和HC(还原性糖碳)含量相较于造林前分别上升了50.35%、62.46%、22.56%、113.53%、230.23%、274.63%和72.54%。复垦地土壤无机碳库与活性有机碳库之间呈显著正相关性,与慢性有机碳库和惰性有机碳库之间无显著相关性。土壤养分因子共能解释40.7%的碳库变量,其中K对土壤碳库的贡献率最高。相关性分析也表明TK和AK与各形态碳组分之间均存在显著正相关关系。[结论]综合分析认为造林能够明显改善和提高乌海露天煤矿复垦地土壤养分含量和碳库水平,这为进一步深入研究造林对干旱荒漠区露天煤矿复垦地土壤质量和生态功能的影响提供了理论和实践基础。
[Objective]To better understand the variation rule of soil carbon pool composition and soil nutrient before and after afforestation and the influence of soil nutrient to soil carbon pool composition in reclaimed mine.[Method]This study was conducted in grassland and forest land of Populus alba var.pyramidalis in reclaimed mine to explore the variation and relation of soil inorganic carbon pool,active organic carbon pool,chronic organic carbon pool,inert organic carbon pool and soil nutrient,and contribution of soil nutrient to soil carbon.[Result]The results showed that the contents of soil nutrients and soil carbon increased after afforestation in reclaimed mine.The content of soil total nitrogen,available nitrogen,total phosphorous,available phosphorous,total potassium and available potassium in forest land increased by 29.27%,17.21%,23.08%,27.04%,51.18%and 53.19%than in grassland,while the content of soil nitric nitrogenin forest land decreased by 71.84%than in grassland.The content of soil organic carbon,particle organic carbon,non-particle organic carbon,dissolved inorganic carbon,dissolved organic carbon,microbial biomass carbon and reducing sugar carbon in forest land increased by 50.35%,62.46%,22.56%,113.53%,230.23%,274.63%and 72.54%than in grassland.There was a significant positive correlation between soil inorganic carbon pool and active organic carbon pool,but no significant correlation with chronic organic carbon pool and inert organic carbon pool.The soil nutrient factors accounted for 40.7%of contribution rate to soil carbon sequestration.The correlation analysis also showed that there was a significant positive correlation between soil total potassium,available potassium and carbon pool composition.[Conclusion]The comprehensive analysis shows that afforestation can improve the soil nutrient status and carbon sequestration significantly in reclaimed area of Wuhai opencast coal mine.This conclusion can be used as a reference for further study on the improvement of soil quality and the restoration of
作者
严洁
于小娟
唐明
段文艳
李鑫
郝一鸣
盛敏
YAN Jie;YU Xiao-juan;TANG Ming;DUAN Wen-yan;LI Xin;HAO Yi-ming;SHENG Min(College of Forestry,Northwest A&F University,Yangling 712100,Shaanxi,China)
出处
《林业科学研究》
CSCD
北大核心
2021年第4期66-73,共8页
Forest Research
基金
国家重点研发计划“西北干旱荒漠区煤炭基地生态安全保障技术”项目(2017YFC0504400)
“采煤迹地地形与新土体近自然构建技术研究”(2017YFC0504404)
“采煤迹地新土体综合培肥增效技术研究(2017YFC0504404-3)”资助。
关键词
矿区复垦地
造林
土壤养分
土壤碳库
reclaimed mine
afforestation
soil nutrient
carbon pool composition
