施用沼液对苏北沿海杨树人工林土壤活性有机碳的影响  

Effects of biogas slurry on soil labile organic carbon of poplar plantation in a coastal area of northern Jiangsu,China

作　　者：卜丹蓉[1] 周丹燕[1] 葛之葳[1] 王国兵[1] 张文文[1] 彭赛[1] 阮宏华[1] 曹国华 

机构地区：[1]南京林业大学生物与环境学院/南方现代林业协同创新中心,南京210037 [2]江苏省东台市林场,江苏东台224200

出　　处：《生态学杂志》2015年第7期1785-1790,共6页Chinese Journal of Ecology

基　　金：国家重点基础研究发展计划项目(2012CB416904);江苏高校优势学科建设工程项目(PAPD);江苏省自然科学基金青年专项(BK20130974)资助

摘　　要：以苏北沿海地区杨树人工林为研究对象,探讨沼液不同施用水平对土壤活性有机碳的影响。试验采用随机区组设计,设置了4种沼液施用水平,分别为CK(0 m3·hm-2)、L(125 m3·hm-2)、M(250 m3·hm-2)和H(375 m3·hm-2)。结果表明,施用沼液显著增加了土壤DOC含量,其中土壤DOC含量在中浓度沼液处理下达到最高,为228.97 mg·kg-1;施用沼液显著降低了土壤MBC;同时,施用沼液显著降低了土壤p H值,并显著增加了土壤NO3--N含量。相关分析表明,土壤p H与NO3--N呈显著负相关,而沼液中N以NH4+-N为主,表明沼液对土壤p H的影响可能与大量铵态氮的输入有关。沼液也显著增加了土壤MBN以及降低了土壤MBC/MBN,表明施用沼液也可能改变土壤的微生物群落的组成结构。To understand the effects of biogas slurry on soil labile organic carbon of poplar plan- tation in a coastal area, we designed four addition treatments of biogas slurry, i.e., CK （no addi- tion）, L （125 m3 · hm-2）, M （250 m3 · hm-2） and H （375 m3 · hm-2） at Dongtai Forest Farm in Jiangsu Province. The results showed that applying biogas slurry increased the concentra- tion of dissolved organic carbon （ DOC）, while decreased soil microbial biomass carbon （MBC）. Moreover, biogas slurry significantly decreased soil pH and increased NO3--N concentration. There was a significant negative correlation between pH and NO3--N concentration, whereas NH4＋-N was mainly the form of N in biogas slurry, indicating that the change of pH might be caused by input of ammonium nitrogen. Biogas slurry also increased soil MBN and decreased soil MBC/MBN, suggesting changes in soil microbial community.

关 键 词：沼液 可溶性有机碳 微生物量碳 杨树人工林 

分 类 号：S714.2[农业科学—林学]