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盐分胁迫对杨树苗期生长和土壤酶活性的影响

张建锋1;张旭东1;周金星1;Franz Makeschin2   

  1. 1中国林业科学研究院林业研究所,国家林业局林木培育实验室,北京100091;2 Soil Institute of Dresden Technological University,01737 Tharandt,Germany

  • 收稿日期:2004-03-10 修回日期:2004-07-05 出版日期:2005-03-18

Effects of salinity stress on poplars seedling growth and soil enzyme activity

ZHANG Jianfeng1,ZHANG Xudong1,ZHOU Jinxing1,Franz Makeschin2   

  1. 1Silvicultural Laboratory of Forestry,Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China;2Soil Institute of Dresden Technological University,Tharandt 01737,Germany

  • Received:2004-03-10 Revised:2004-07-05 Online:2005-03-18

摘要: 通过盐分胁迫下杨树2个无性系的盆栽试验,发现盐分对苗木的生长有一定的抑制作用.随着盐分浓度的提高,苗高、地上与地下部分生物量都呈下降趋势;当盐分浓度为0.2%、0.4%、0.6% 和0.8%时,P1、P2的新稍生长量分别比对照下降23.24%、48.56%、70.76%、83.33%和71.77%、83.25%、86.28%、91.39%;P2地上生物量分别比对照下降72.44%、82.92%、92.82%和94.41%.回归分析发现,盐分浓度与叶片叶绿素含量之间存在线性相关关系,与脯氨酸含量之间存在抛物线形相关关系.土壤中盐分的增加不仅影响到植物的生长发育,而且对土壤自身的物理、化学性状也产生不良效应.同时测定了盆栽土壤中葡萄糖苷酶和左旋天门冬酰胺酶活性的变化.结果表明,两种酶活性都随土壤中盐分浓度的提高而下降.当盐分浓度为0.2%、0.4%、0.6%和0.8%时,P1土壤中葡萄糖苷酶活性分别比对照下降了10.96%、20.07%、30.96%和37.44%;而P2土壤中葡萄糖苷酶活性分别比对照下降11.21%、18.94%、34.89%和41.31%,说明盐分对土壤的理化性状和肥力状况都产生了不良影响.参试的2个无性系中,P1的耐盐能力强于P2.

关键词: 石生藓, 森林植被, 干扰, 蓄土保水

Abstract: A pot culture experiment with two clones of poplars (P1 and P2) showed that soil salinity had a definite inhibitory effect on the establishment and growth of seedlings.The survival rate,seedling height and weight,and root weight were all declined with increasing soil salinity.When the salinity was 0.2%, 0.4%,0.6% and 0.8%,the shoot growth of P1 and P2 decreased by 23.24%,48.56%,70.76% and 83.33%,and 71.77%,83.25%,86.28% and 91.39%,respectively,in comparing with the control.Regressive analyses showed that soil salinity had a linear relationship with chlorophyll content, and a binomial relationship with leaf proline content. The activities of soil β-glucosidase and L-asparaginase were decreased with increasing soil salinity.When the salinity was 0.2%,0.4%,0.6% and 0.8%,the β-glucosidase activity in P1 and P2 soils decreased by 10.96%,20.07%,30.96% and 37.44%, and 11.21%,18.94%,34.89% and 41.31%,respectively.The salinity tolerance of P1 was better than that of P2.

Key words: Petrophytia moss, Forest vegetation, Disturbance, Water and soil conservation