摘要
以6年生的冬枣(Zizyphus jujuba Mill.)为试材,分别在行间两侧距树干3倍、5倍和7倍胸径距离处对其进行根剪处理,研究了根剪对冬枣根际土理化性状及生物学特性的影响。结果表明:与对照相比,3倍胸径距离根剪提高了根际土的有效N,P,K含量和pH值以及农药残留的含量;减少了根际土中细菌和真菌的数量,处理间差异达到显著水平,而对放线菌数量则无明显影响;3倍胸径距离根剪抑制了根际土的过氧化氢酶、蔗糖酶、磷酸酶及脲酶活性;降低了有机质含量及根分泌物中氨基酸总量、有机酸总量和总糖含量。与3倍胸径距离根剪相比,5倍胸径距离根剪后根际土中的有效N,P,K含量、有机质含量、酶活性、根分泌物、微生物数量均有所增加,pH值以及农药残留量则有所降低。7倍胸径距离根剪,根际土中的各项指标与对照相比无明显差异。综合分析认为,3倍胸径距离根剪对根际土理化性状及生物学特性有较大的影响。
The root system of six-year-old winter jujube trees were manually pruned with a sharp spade at 3,5 or 7 times trunk diameter distance along both inter-row sides prior to buds break on April 26th 2008 in Binzhou Chinese jujube orchards,to study the effects of root pruning on physio-chemical and biological characteristics of winter jujube（Zizyphus jujube Mill.） rhizosphere soil.The results showed that the root pruning of 3 times trunk diameter distance increased the available N,P,K concentrations,pH value and pesticides residues in the rhizosphere soil and decreased the populations of bacteria and fungi in contrast to the control.However,no apparent differences of actinomyces populations were found between the treatments.Compared to the control,root pruning inhibited the activities of catalase,invertase,phosphatase and urease enzymes,and at the same time decreased the concentration of organic matter in the rhizosphere soil and that of total amino acids,total organic acids and total sugars in the root exudates at the 3 times trunk diameter distance.As affected by root pruning at the 5 times trunk diameter distance,the concentrations of available N,P,K,organic matter contents,enzymes activities,root exudates,microbial populations were increased,but pH value and pesticides residues in the rhizosphere soil were decreased to some extent in relative to root pruning at the 3 times trunk diameter distance.By statistical analysis,no differences of each indicator were noticed between 7 times trunk diameter distance and the control.It is proposed that root pruning has greater impact on physio-chemical characteristics and biological properties of rhizosphere soil at the 3 times trunk diameter distance.
出处
《水土保持学报》
CSCD
北大核心
2009年第5期215-218,共4页
Journal of Soil and Water Conservation
基金
国家"十一五"科技支撑计划重大专项项目(2006BAD03A1505-3)
山东省科学技术发展计划攻关项目(2007GG2009007)
关键词
冬枣
根剪
根际土
理化性状
生物学特性
winter jujube tree root pruning rhizosphere soil physio-chemical properties biological characteristics
