黄土区不同封育时期天然草地的根系生物量分布

白于; 苏纪帅; 程积民

黄土区不同封育时期天然草地的根系生物量分布

白于¹,
苏纪帅¹,
程积民^2,3,4

1.
西北农林科技大学动物科技学院,陕西杨凌 712100
2.
1. 西北农林科技大学动物科技学院,陕西杨凌 712100
3.
2. 中国科学院水利部水土保持研究所,陕西杨凌 712100
4.

基金项目:

中国科学院战略性先导科技专项——应对气候变化的碳收支认证及相关问题(XDA05050202)

国家自然科学基金重点项目(41230852)

国家林业局公益性行业科研专项(200904056)

草地农业生态系统国家重点实验室

摘要: 利用根钻法分析了宁夏云雾山的5种不同封育年限天然草地0－80 cm土层的根系生物量,并对根系生物量与土壤含水量、土壤容重的相关关系进行了研究。结果表明,1)不同封育年限草地根系生物量均随土层加深而减少,且集中分布在0－30 cm土层;2)随着封育年限的延长,根系生物量逐渐增加并在封育30年达到最大值;3)随着封育的进行,土壤含水量呈“S”型曲线增加的趋势;4)表层土壤的容重降低,土壤结构得到改善;5)5种封育年限草地的根系生物量与土壤含水量均无显著相关性。

关键词:

English

Root biomass distribution of natural grasslands with different enclosing years in the Loess Plateau

1.
College of Animal Science and Technology, Northwest A&
2.
1. College of Animal Science and Technology, Northwest A&
3.
2. Institute of Soil and Water Conversation of Chinese Academy of Sciences and the Ministry of Water Resources, Yangling 712100, China
4.

Received Date: 2013-07-09
Publish Date: 2013-11-14

Abstract: An investigation on root biomass distribution in 0-80 cm soil layer of natural grasslands with different enclosing years was conducted in Yunwu Mountain, by employing soil core method. The correlations among root biomass, soil water content and soil bulk density were also studied. The results indicated that: 1) Root biomasses centralize in 0-30 cm soil layer and decrease with the increasing of soil depth for all natural grasslands with different enclosing years; 2)Root biomass increases with the increasing of enclosing year, and reaches the maximum value in grassland with a 30 years enclosing; 3)With the increasing of enclosing years, soil water content of grassland increases with a S-type, soil bulk density of topsoil decreases, and the structure of soil is improved; 4)There is no significant correlation between root biomasses and soil water contents of 5 kinds of enclosed grasslands.

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参考文献(1)

[1]

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黄土区不同封育时期天然草地的根系生物量分布

English

Root biomass distribution of natural grasslands with different enclosing years in the Loess Plateau

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