采煤沉陷地复垦土壤团聚体碳氮磷化学计量特征  

Carbon, Nitrogen and Phosphorus nutrients and stoichiometric characteristics of reclaimed soil aggregate in coal mining subsidence land

作　　者：刘美英 李文龙[1,2] 赵晶 许学慧[1,2] LIU Meiying;LI Wenlong;ZHAO Jing;XU Xuehui(College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Hohhot 010018,China;Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resource,Inner Mongolia Agricultural University,Hohhot 010018,China)

机构地区：[1]内蒙古农业大学草原与资源环境学院,内蒙古呼和浩特010018 [2]内蒙古农业大学内蒙古自治区土壤质量与养分资源重点实验室,内蒙古呼和浩特010018

出　　处：《煤炭科学技术》2022年第12期271-277,共7页Coal Science and Technology

基　　金：内蒙古自治区高等学校科学研究资助项目(NJZZ18043);国家自然科学基金资助项目(41301605)。

摘　　要：为明确不同林型复垦土壤团聚体养分及其化学计量变化,揭示采煤沉陷地土壤养分的固持及限制特征,进而筛选出最佳的复垦林型。本研究在神府-东胜矿区采煤沉陷地上设置长柄扁桃、欧李、文冠果3种复垦林型,同时以附近未沉陷且未种植的废弃农田作为对照,基于干筛法探究0~40 cm土层土壤机械稳定性团聚体组成、土壤有机碳(SOC)、全氮(TN)、全磷(TP)含量及其化学计量特征对长期植被复垦的响应规律。结果表明:不同复垦林型土壤微团聚体含量下降而大团聚体含量增加,各林型>0.25 mm大团聚体总量均超过了70%。不同林型土壤<0.053 mm矿质颗粒中SOC、TN、TP含量最高,大团聚体次之。团聚体对土壤SOC、TN以及TP的贡献随团聚体粒级的增大而增加,3种林型>0.25 mm大团聚体对土壤SOC、TN和TP的贡献率分别为72%~83%、66%~74%、65%~82%。不同林型土壤团聚体C/N、C/P和N/P均低于全国及全球平均水平。土壤TN与SOC、TP呈显著正相关,与C/N呈显著负相关;TP与C/P、N/P呈显著负相关。主要结论为植被复垦增加土壤大团聚体含量,而大团聚体对土壤碳氮磷的贡献率最大,其中文冠果对土壤碳氮磷的贡献率大于其他林型。不同林型土壤团聚体C/P的变化范围为5.44~20.83,低于全国及全球平均水平,表明采煤沉陷区土壤缺乏氮元素,氮元素是主要养分限制因子。In order to clarify the nutrients and stoichiometric changes of soil aggregates in different forest types, reveal the soil nutrient retention and limitation characteristics of coal mining subsidence land, and then screen out the best reclaimed-forest types. In this study,three types of reclaimed forests, namely Amygdalus sylvestris, Prunus sylvestris, and Xanthomonas serrata, were set up on the ShenfuDongsheng mining area in the coal mining subsidence area. At the same time, the nearby unsettled and unplanted abandoned farmland was used as a control, based on the dry sieve method to explore the soil mechanical stability aggregate composition, soil SOC(organic carbon),TN(total nitrogen), TP(total phosphorus) content and its stoichiometric characteristics in response to long-term vegetation reclamation in0-40 cm soil law. The results showed that the content of soil micro-aggregates of different reclaimed-forest types decreased while the content of large aggregates increased, and the total amount of large aggregates >0.25 mm in each forest type exceeded 70%. The content of SOC, TN and TP in soils of different forest types <0.053 mm is the highest, followed by large aggregates. The contribution of aggregates to soil SOC, TN and TP increased with the increase of aggregate fraction. The contribution rates of three forest types >0.25 mm large aggregates to soil SOC, TN and TP were 72%-83%,66%-74%, 65%-82% respectively. The C/N, C/P and N/P of soil aggregates of different forest types were all lower than the average of national and global. Soil TN was positively correlated with SOC and TP, and negatively correlated with C/N(P<0.05);TP was negatively correlated with C/P and N/P significantly(P<0.05). In summary, vegetation reclamation increased the content of soil large aggregates, and large aggregates contributed the most to soil Carbon, Nitrogen and Phosphorus. The contribution rate of Chinese canopy to soil Carbon, Nitrogen and Phosphorus was greater than that of other forest types. The variation of C/P of soil aggrega

关 键 词：采煤沉陷地 复垦区 植被复垦 土壤团聚体 化学计量比 

分 类 号：S152.9[农业科学—土壤学]