三峡库区马尾松人工林凋落物和根系输入对土壤理化性质的影响

应用生态学报

三峡库区马尾松人工林凋落物和根系输入对土壤理化性质的影响

葛晓改^1,2,黄志霖¹,程瑞梅¹,曾立雄¹,肖文发^1**,谭本旺³

(¹中国林业科学研究院森林生态环境与保护研究所/国家林业局森林生态环境重点实验室, 北京 100091; ²中国林业科学研究院亚热带林业研究所, 浙江富阳 311400; ³湖北省秭归县林业局, 湖北宜昌 443631)

出版日期:2012-12-18 发布日期:2012-12-18

Effects of litterfall and root input on soil physical and chemical properties in Pinus massoniana plantations in Three Gorges Reservoir Area, China.

GE Xiao-gai^1,2, HUANG Zhi-lin¹, CHENG Rui-mei¹, ZENG Li-xiong¹, XIAO Wen-fa¹, TAN Ben-wang²

(¹State Forestry Administration Key Laboratory of Forest Ecology and Environment, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China; ²Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400, Zhejiang, China; ³Zigui Bureau of Forestry, Yichang 443651, Hubei, China)

Online:2012-12-18 Published:2012-12-18

摘要/Abstract

摘要： 从凋落物和根系生物量角度对三峡库区不同年龄马尾松人工林土壤理化性质进行测定.结果表明: 马尾松成熟林凋落物的年产量分别比近熟林、中龄林高19.4%和65.7%,凋落物现存量大小为成熟林＞中龄林＞近熟林,周转系数为近熟林(0.51)＞成熟林(0.40)＞中龄林(0.36);根系总生物量、活根及死根生物量均为中龄林最高、近熟林最低;中龄林土壤总孔隙度最大,容重最小;土壤有机质和总氮含量均是成熟林＞中龄林＞近熟林;近熟林土壤中硝态氮含量比重较大,中龄林和成熟林铵态氮含量比重较大.近熟林凋落物产量适中、周转系数最大,土壤养分最低;中龄林根系生物量和总孔隙度最大,土壤容重最小;成熟林土壤养分含量最高,根系生物量较低.根系生物量增加可以改善土壤的物理性质.

Abstract: An investigation was made on the soil physical and chemical properties in differentaged Pinus massoniana plantations in Three Gorges Reservoir Area under effects of litterfall and roots. The annual litter production in mature stand was 19.4% and 65.7% higher than that in nearly mature and middle-aged stands, respectively. The litter standing amount was in the sequence of mature stand > middleaged stand ＞ nearly mature stand, while the litter turnover coefficient was in the order of nearly mature stand (0.51) ＞ mature stand (0.40) ＞ middle-aged stand (0.36). The total root biomass, live root biomass, and dead root biomass were the highest in middle-aged stand, and the lowest in nearly mature stand. In middle-aged stand, soil total porosity was the highest, and soil bulk density was the lowest. Soil organic matter and total nitrogen contents were in the order of mature stand > middle-aged stand > nearly mature stand, soil nitrate nitrogen occupied a larger proportion of soil mineral N in nearly mature stand, while ammonium nitrogen accounted more in middle-aged and mature stands. In nearly mature stand, litter production was moderate but turnover coefficient was the highest, and soil nutrient contents were the lowest. In middle-aged stand, root biomass and soil total porosity were the highest, and soil bulk density were the lowest. In mature stand, root biomass was lower while soil nutrient contents were the highest. The increase of root biomass could improve soil physical properties.

葛晓改1,2,黄志霖1,程瑞梅1,曾立雄1,肖文发1**,谭本旺3. 三峡库区马尾松人工林凋落物和根系输入对土壤理化性质的影响[J]. 应用生态学报.

GE Xiao-gai1,2, HUANG Zhi-lin1, CHENG Rui-mei1, ZENG Li-xiong1, XIAO Wen-fa1, TAN Ben-wang2. Effects of litterfall and root input on soil physical and chemical properties in Pinus massoniana plantations in Three Gorges Reservoir Area, China.[J]. Chinese Journal of Applied Ecology.