干旱区生态环境知识资源中心(Arid): 干湿交替对科尔沁沙地人工林叶凋落物分解和养分释放的影响

Arid

	干湿交替对科尔沁沙地人工林叶凋落物分解和养分释放的影响
其他题名	Effects of drying-rewetting on leaf litter decomposition and nutrient releases in forest plantations in Horqin Sandy Land,China
	黎锦涛; 孙学凯; 胡亚林; 赵珊宇; 曾德慧
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2017
卷号	28 期号:6 页码:1743-1752
中文摘要	在干旱/半干旱地区,土壤干湿交替现象非常明显.在全球气候变化背景下,预测未来科尔沁沙地的土壤干湿交替变化强度将进一步加剧.本研究采用室内原位土柱培养方法,模拟干湿交替对科尔沁沙地小叶杨和樟子松叶凋落物分解速率及养分释放的影响.试验设置3个处理:恒湿处理(CM) 、轻度干湿交替处理(DW1,10 d干燥+20 d湿润)和重度干湿交替处理(DW_2,20 d干燥+10 d湿润).整个培养试验共处理180 d,其中进行4次干湿交替循环处理,并在干湿交替处理结束后,将各处理置于相同土壤水分条件(60%田间持水量)延时培养60 d.结果表明:小叶杨和樟子松叶凋落物分解及养分释放对干湿交替的响应一致.在干湿交替期间,DW_2处理显著抑制叶凋落物分解及叶凋落物C、木质素和总酚释放;与CM相比,DW_2处理叶凋落物质量、C、木质素和总酚残留率分别增加17.4%、23.8%、35.2%和32.7%,而干湿交替对叶凋落物N和P养分释放无显著影响.干湿交替处理结束和延时培养结束时,不同干湿处理叶凋落物分解及养分残留率的变化具有一致性.而延时培养期间DW_2处理凋落物分解速率、叶凋落物C和木质素释放加快,表明干湿交替对叶凋落物分解及养分释放具有短期延时效应.
英文摘要	Soil drying-rewetting is a common phenomenon in arid and semi-arid regions. Under the background of global climate change,it is predicted that the intensity of soil drying-rewetting cycle in Horqin Sandy Land will be further strengthened in the future. In this study,we conducted an insitu soil column incubation experiment for 180 days to investigate the effects of soil drying-rewetting on leaf litter decomposition and nutrient releases of Populus simonii and Pinus sylvestris var. mongolica in Horqin Sandy Land. There were three treatments: Constantly moist treatment (CM,60% water holding capacity during whole incubation period),mild drying-rewetting treatment (DW1,gradual drought for 10 days plus 60% WHC for 20 days) and heavy drying-rewetting treatment (DW_2, gradual drought for 20 days plus 60% WHC for 10 days). To evaluate their delayed effects,leaf litter in all three treatments were incubated for 60 days under same and constant humid condition(60% WHC) after four cycles of soil drying-rewetting. The responses of litter decomposition to soil drying-rewetting cycles and nutrient releases of P. simonii and P. sylvestris var. mongolica were similar during the drying and rewetting period. Litter mass loss and the release of C,lignin and total phenol were decreased by 17.4%,23.8%,35.2% and 32.7% in DW_2 treatment compared with CM treatment. There was no significant difference in release of leaf litter N or P among the drying-rewetting treatments. There were consistent changes of litter mass loss and nutrient releases among the treatments at the end of drying-rewetting and delayed incubation period. However,litter decomposition rate and litter C and lignin release rates were increased in DW_2 treatment compared with CM treatment during the delayed incubation period,indicating a short-term delayed effect.
中文关键词	干湿交替 ; 凋落物分解 ; 养分释放 ; 半干旱区 ; 科尔沁沙地
英文关键词	drying-rewetting litter decomposition nutrient release semi-arid region Horqin Sandy Land
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Forestry
WOS研究方向	Forestry
CSCD记录号	CSCD:6005161
来源机构	中国科学院沈阳应用生态研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236907
作者单位	黎锦涛, 中国科学院沈阳应用生态研究所大青沟沙地生态实验站, 沈阳, 辽宁 110016, 中国.; 孙学凯, 中国科学院沈阳应用生态研究所大青沟沙地生态实验站, 沈阳, 辽宁 110016, 中国.; 胡亚林, 中国科学院沈阳应用生态研究所大青沟沙地生态实验站, 沈阳, 辽宁 110016, 中国.; 赵珊宇, 中国科学院沈阳应用生态研究所大青沟沙地生态实验站, 沈阳, 辽宁 110016, 中国.; 曾德慧, 中国科学院沈阳应用生态研究所大青沟沙地生态实验站, 沈阳, 辽宁 110016, 中国.
推荐引用方式 GB/T 7714	黎锦涛,孙学凯,胡亚林,等. 干湿交替对科尔沁沙地人工林叶凋落物分解和养分释放的影响[J]. 中国科学院沈阳应用生态研究所,2017,28(6):1743-1752.
APA	黎锦涛,孙学凯,胡亚林,赵珊宇,&曾德慧.(2017).干湿交替对科尔沁沙地人工林叶凋落物分解和养分释放的影响.应用生态学报,28(6),1743-1752.
MLA	黎锦涛,et al."干湿交替对科尔沁沙地人工林叶凋落物分解和养分释放的影响".应用生态学报 28.6(2017):1743-1752.