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黄土丘陵沟壑区不同植被带植物群落的细根分布特征
寇萌1; 焦菊英1,2; 王巧利3; 尹秋龙4
2016
Source Publication农业机械学报
Volume47Issue:2Pages:161-171
Abstract

以黄土丘陵沟壑区延河流域3 个植被带( 森林带、森林草原带、草原带) 不同植物群落的细根( 直径d≤
2 mm) 为研究对象,对植物群落0 ~ 20 cm 土层细根根长密度、根系生物量、比根长进行了研究。结果表明,3
个植被
带不同植物群落直径d≤1 mm 的根系根长密度占总细根的90% 以上,根系生物量占53% 以上。有较大比例的直
径d≤1 mm 的根系不仅在植物的生长活动中贡献很大,且在改善土壤结构方面发挥重要作用; 植物群落细根d≤
2 mm 生物量从南部森林带到北部草原带呈递减趋势,比根长从南部森林带到北部草原带呈递增趋势,草原带的根
长密度显著低于其他植被带( P < 0. 05) 。根长密度与根系生物量变化趋势一致,乔、灌群落高于草本群落,但比根
长表现为草本群落显著高于乔、灌群落( P < 0. 05) ; 乔、灌群落和以达乌里胡枝子为次优种或优势种的群落根长密
度和根系生物量较高,植物根系生长能力强,根系发达。以狼牙刺、杠柳、白羊草为优势种的群落比根长较高,具有
较高的水分、养分潜在吸收率和生长速率; 以狼牙刺、杠柳、铁杆蒿、白羊草为优势种的群落,根系参数( 根长密度、
根系生物量、比根长) 在森林草原带显著高于其他植被带( P < 0. 05) ,这些群落在此环境下,更能有效吸收土壤水
分、养分,在提高土壤抗侵蚀能力方面发挥着重要作用。

Other Abstract

The objective of this study was to clarify the characteristics of fine roots ( diameter d≤2 mm)
parameters ( root biomass,root length density and specific root length) in 0 ~ 20 cm soil layer under
different plant communities in forest zone,forest steppe zone and steppe zone of the Yan river basin in
hill-gully region of Loess Plateau. Soil drill method was used to collect root samples. Vernier caliper was
used to measure root diameter in two grades of 0 ~ 1 mm and 1 ~ 2 mm. Root length of two diameter
grades was measured,then root samples were dried to constant weight at 85℃ and weighed. The main
results were as follows: ( 1) In the three vegetation zones,the proportion of root length density ( d≤
1 mm) and root biomass of different communities accounted for 90% and 53% of the total fine root,respectively. The root ( d≤1 mm) ,which accounted for a large proportion of the total fine root,not only
contributed greatly for the plant growth,but also played an important role in improving soil structure.
( 2) Root biomass ( d≤2 mm) of different plant communities showed a decreasing trend from southern
forest zone to northern steppe zone,while specific root length showed a increasing trend from southern
forest zone to northern steppe zone,root length density in steppe zone was significantly lower than those in
other two vegetation zones ( P < 0. 05) . The variation tendency of root length density and root biomass
was the same,and root length density and root biomass of tree community and shrub community were
higher than those of herb community. But specific root length of herb community was significantly higher
than those of tree community and shrub community ( P < 0. 05 ) . ( 3 ) Root length density and root
biomass of tree community,shrub community and Lespedeza davurica dominated community were higher
than those of other communities,the root growth of these communities was vigorous,and root system of
these communities developed well. The specific root lengths of Sophora viciifolia,Periploca sepium and
Bothriochloa ischaemun respectively dominated communities were higher than those of other communities,
thus these communities had stronger potential ability to absorb soil moisture and nutrients,and higher
growth rate. ( 4) The root parameters of Sophora viciifolia,Periploca sepium,Artemisia gmelinii and
Bothriochloa ischaemun respectively dominated communities,which distributed in forest steppe zone,
were significantly bigger than those of other communities distributed in the other two vegetation zones
( P < 0. 05) . It indicated that these communities could absorb soil moisture and nutrients more efficiently
and play an important role in increasing soil anti-erodibility in forest steppe zone.

Keyword根长密度 根系生物量 比根长 植物群落
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8588
Collection水保所知识产出(1956---)
Affiliation1.中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室
2.西北农林科技大学水土保持研究所
3.西北农林科技大学资源环境学院
4.西北农林科技大学林学院
First Author Affilication中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
寇萌,焦菊英,王巧利,等. 黄土丘陵沟壑区不同植被带植物群落的细根分布特征[J]. 农业机械学报,2016,47(2):161-171.
APA 寇萌,焦菊英,王巧利,&尹秋龙.(2016).黄土丘陵沟壑区不同植被带植物群落的细根分布特征.农业机械学报,47(2),161-171.
MLA 寇萌,et al."黄土丘陵沟壑区不同植被带植物群落的细根分布特征".农业机械学报 47.2(2016):161-171.
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