IMHE OpenIR  > 山地表生过程与生态调控重点实验室
藏北高寒草地地下生物量特征及其与土壤水分的关系
Alternative TitleDynamics of Belowground Biomass and Its Relationship with Soil Moisture in Alpine Grassland on the North Tibetan Plateau
马星星1,2; 鄢燕1; 鲁旭阳1; 王小丹1
Corresponding Author王小丹
2016-04
Source Publication生态环境学报
ISSN1674-5906
Volume25Issue:2Pages:189-195
Abstract植物地下生物量是高寒生态系统重要的碳库,可以反映植物对极端环境的适应特征。以高寒草原、高寒草甸草原和高寒草甸3 种主要草地类型为对象,对比分析了非生长季和生长季的地下生物量,探究不同类型的高寒草地地下生物量分配机制及其动态变化过程。结果表明:(1)3 种草地地下生物量的空间分布在生长季和非生长季均呈现“T”字型分布。在这两个时期,3 种草地0~10 cm 的生物量占总地下生物量的比例均表现为:高寒草原(91.20%,94.72%)>高寒草甸草原(83.17%,92.07%)>高寒草甸(67.04%,68.38%),且其比例在生长季均有增加;(2)两个时期高寒草甸地下生物量均最高(1 620.39±71.09)g·m-2,(3 950.08±291.46)g·m-2,非生长季高寒草原最低(136.24±9.14)g·m-2,生长季高寒草甸草原最低(133.97±6.93)g·m-2;高寒草甸和高寒草原地下生物量在生长季都有显著增加,而高寒草甸草原显著减少;(3)地下生物量与土壤含水量有显著的正相关关系,在同样的温度条件下,土壤含水量是地下生物量的重要影响因子;而生长季是藏北地区降水比较集中的时期,土壤表层水分的增加促使根系向表层生长。
Other AbstractRoot biomass is an important belowground C pool in alpine ecosystem and an indicator of plant adaptation to extreme environment. We conducted a field experiments to explore belowground biomass dynamics and its vertical distribution in three types of grasslands (alpine steppe, alpine meadow steppe and alpine meadow) in April (non-growing season) and August (growing season) in 2013. The results showed that, (1) the belowground biomass showed a pattern of “T” distribution. The proportion of 0~10 cm
belowground biomass to the total belowground biomass was in a descending order of alpine steppe (91.20%, 94.72%), alpine meadow steppe (83.17%, 92.07%) and alpine meadow (67.04%, 68.38%). The proportions of belowground biomass at depth of 0~10
cm increased for all the three grasslands during growing season. (2) In the two periods, alpine meadow had the highest belowground biomass (1620.39±71.09), (3950.08±291.46) g·m-2. In non-growing season, alpine steppe had the lowest belowground biomass (136.24±9.14) g·m-2, while alpine meadow steppe had the lowest belowground biomass in growing season (133.97±6.93) g·m-2. The belowground biomass of alpine meadow and alpine steppe increased significantly, but that of alpine meadow steppe decreased significantly in growing season. (3) Belowground biomass showed a positive relationship with soil moisture, which implied that soil moisture, was a key factor to determine the belowground biomass accumulation under the same temperature. More belowground biomass was distributed to the surface soil in the growing season may result from the increasing precipitation and soil moisture in the topsoil during summer.
Keyword高寒草地 地下生物量 空间分布 季节变化
Subject AreaX17 ; Q948
DOI10.16258/j.cnki.1674-5906.2016.02.002
Indexed ByCSCD ; 北大中文核心
Language中文
CSCD IDCSCD:5676713
Funding Organization中国科学院战略性先导科技专项(XDB03030505 ; XDA05050506) ; 国家自然科学基金项目(41201053)
Citation statistics
Cited Times:9[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/17398
Collection山地表生过程与生态调控重点实验室
Affiliation1.中国科学院水利部成都山地灾害与环境研究所 山地表生过程与生态调控重点实验室,四川 成都 610041
2.中国科学院大学,北京 100049
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
马星星,鄢燕,鲁旭阳,等. 藏北高寒草地地下生物量特征及其与土壤水分的关系[J]. 生态环境学报,2016,25(2):189-195.
APA 马星星,鄢燕,鲁旭阳,&王小丹.(2016).藏北高寒草地地下生物量特征及其与土壤水分的关系.生态环境学报,25(2),189-195.
MLA 马星星,et al."藏北高寒草地地下生物量特征及其与土壤水分的关系".生态环境学报 25.2(2016):189-195.
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