寇萌,焦菊英,王巧利,尹秋龙.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.
Kou Meng,Jiao Juying,Wang Qiaoli,Yin Qiulong.Fine Root Distribution Characteristics of Plant Community in Different Vegetation Zones in Hill-gully Region of Loess Plateau[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(2):161-171.
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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   [下载全文]
Fine Root Distribution Characteristics of Plant Community in Different Vegetation Zones in Hill-gully Region of Loess Plateau   [Download Pdf][in English]
投稿时间:2015-07-28  
DOI:10.6041/j.issn.1000-1298.2016.02.021
中文关键词:  根长密度  根系生物量  比根长  植物群落
基金项目:国家自然科学基金项目(41371280)
作者单位
寇萌 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 
焦菊英 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
西北农林科技大学 
王巧利 西北农林科技大学 
尹秋龙 西北农林科技大学 
中文摘要: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。
Kou Meng  Jiao Juying  Wang Qiaoli  Yin Qiulong
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources,State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources; Northwest A&F University,Northwest A&F University and Northwest A&F University
Key Words:root length density  root biomass  specific root length  plant community
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.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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