土壤类型及其含水量与盐分对胡杨根蘖发生影响  

Impacts of Soil type,Water Content and Salinity on the Root Sucker Occurrence Mechanism of Populus euphratica

作　　者：井家林[1] 夏延国[1] 郝鹏[1] 李景文[1] 冯益明[2] 谭志刚 杨雪芹 

机构地区：[1]北京林业大学,北京100083 [2]中国林业科学研究院荒漠化研究所 [3]内蒙古额济纳旗林业局

出　　处：《东北林业大学学报》2013年第12期42-46,63,共6页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(31070553);中国林业科学研究院重大项目(CAFYBB2011002)资助

摘　　要：根蘖繁殖更新是我国珍贵的胡杨林维持的关键环节,以胡杨根蘖发生过程为研究对象,通过采用不同的土壤类型、土壤含水量及土壤盐分等影响胡杨根蘖发生关键性因素的控制试验,就土壤类型、土壤含水量与盐分等环境因子对胡杨根蘖的影响进行了研究,以揭示胡杨根蘖繁殖发生机制。研究结果表明：（1）土壤类型试验对根蘖数量与生长都有影响,表现在沙土中的最大根蘖芽数量,最大萌蘖点数量都是要显著大于林下土和河岸土。（2）水分梯度试验表明：15%含水量时,最大根蘖芽数量和最大萌蘖点数量都是显著大于其余各组。15%水分梯度下,根蘖的生长时间最长,并且在生长的9 d左右,达到了最大单位周期伸长总长度;（3）含盐量的试验表明：电导率为0.9~1.1 S·m-1条件下,横走根产生的最大根蘖芽和萌蘖点数量最多,随着盐分含量的升高,达到最大每周期伸长总长度所需的时间有增长的趋势。Three single factorial controlled experiments（ soil types,water content and salinity） were conducted to analyze the relationship between the adventitious buds,root suckers and soil environment in Ejina oasis. Soil types,water content and salinity are the limiting factors to the occurrence of root suckers,respectively. The soil type tests showed that spot maximum and bud maximum number of root segments in sand soil are significantly different from those in the forest soils and bank soil. Furthermore,new fine root can grow under the condition of the sand soil. When the soil content reaches a certain value,the soil salt content is low,Populus euphratica root sucker can survive,the spot maximum number and bud maximum quantity in the conditions of 15% water content are significantly higher than the rest of the groups,and the root sucker elongation period lasts maximum of 13 cycles（ i. e.,39 days） and reaches the maximum total length in the third period（ 9 days）. Salinity test shows that root segments have the most number of spot maximum and bud maximum when the conductivity is 0. 9-1. 1 S·m-1. With the increasing of the soil salinity,the total length per period elongation time increases.

关 键 词：胡杨 土壤盐分 土壤含水量 根蘖 土壤特征 

分 类 号：Q945.5[生物学—植物学] Q948.1