黄土丘陵区不同树龄旱作枣园细根空间分布特征

以黄土丘陵区2、6、10、15龄旱作枣林（Ziziphus jujube cv.Junzao）为研究对象,采用根钻法,距树干0.5、1、1.5 m处、分层（0.2 m）钻取土样,分析了旱作枣林细根随树龄的变化特征。结果表明：随着枣林树龄增大,枣林细根根长密度增加,比根长减小;2龄枣树细根主要分布于径向1.5 m以内和垂向1.6 m以上,10、15龄枣树细根分布超过径向1.5 m和垂向3 m以上,并在株间形成根系高密度区,6龄枣树细根径向分布范围大于2龄,垂向分布与10龄和15龄接近;不同树龄枣林细根根长密度均随土层深度增加而减小,且主要集中在0~0.6 m土层中;随着树龄增加,细根根长密度径向...

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Bibliographic Details
Published in	农业工程学报 Vol. 31; no. 20; pp. 140 - 146
Main Author	李陆生赵西宁高晓东吴普特李虹辰凌强孙文浩
Format	Journal Article
Language	Chinese
Published	西北农林科技大学水利与建筑工程学院,杨凌 712100 2015 中国科学院水利部水土保持研究所,杨凌 712100 中国旱区农业研究院,杨凌 712100%中国旱区农业研究院,杨凌 712100
Subjects	密度干旱旱作枣园树龄根根长密度比根长 density 密度干旱 drought rain-fed jujube plantation fine root length density root 旱作枣园根 specific root length 根长密度比根长 stand age 树龄
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ISSN	1002-6819
DOI	10.11975/j.issn.1002-6819.2015.20.020

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Summary:	以黄土丘陵区2、6、10、15龄旱作枣林（Ziziphus jujube cv.Junzao）为研究对象,采用根钻法,距树干0.5、1、1.5 m处、分层（0.2 m）钻取土样,分析了旱作枣林细根随树龄的变化特征。结果表明：随着枣林树龄增大,枣林细根根长密度增加,比根长减小;2龄枣树细根主要分布于径向1.5 m以内和垂向1.6 m以上,10、15龄枣树细根分布超过径向1.5 m和垂向3 m以上,并在株间形成根系高密度区,6龄枣树细根径向分布范围大于2龄,垂向分布与10龄和15龄接近;不同树龄枣林细根根长密度均随土层深度增加而减小,且主要集中在0~0.6 m土层中;随着树龄增加,细根根长密度径向分布无差异（10、15龄）。研究表明：2、6龄枣林应靠近树干地表处施肥,而理论上成熟期10、15龄枣林可在林内任意位置施肥;同时为防止枣林减产和退化,需增加枣林管理措施以有效降低枣树自身奢侈性耗水和非生产性耗水。
Bibliography:	Fine roots（roots ≤2 mm in diameter） are the primary organ of absorbing water and nutrients in forest systems. Since the initiation of the large-scale ecological rehabilitation project（known as ＂Grain for Green＂ project） by the Chinese central government in 1999, the acreage of the jujube orchard has been increased rapidly on the Loess Plateau mainly for conserving soil plus water and raising economic benefits. However, the knowledge of fine roots dynamics during stand development is lacked to guide management practices for rain-fed jujube plantations, and most studies focused on the vertical dynamic of fine roots, with the method of random sampling and missed characterizing the radial distribution of fine roots. The objective of this study was to investigate the characteristics of fine roots in a rain-fed jujube plantation（Ziziphus jujube Mill. cv. Lizao） with a range of stand ages（2, 6, 10, and 15 years） in Qingjian County in Shaanxi Province（37°15′N, 118°18′E）. Specifically, the fine root length density（FRL
ISSN:	1002-6819
DOI:	10.11975/j.issn.1002-6819.2015.20.020