春季与秋季刈割对疏叶骆驼刺叶片功能性状的影响

Influence of spring and fall clipping on the leaf functional traits of Alhagi sparsifolia

本研究以塔克拉玛干沙漠南缘策勒县荒漠-绿洲过渡带为研究区,探讨了春季刈割与秋季刈割对自然植被疏叶骆驼刺(Alhagi sparsifolia)叶片功能性状的影响。结果表明,骆驼刺经刈割处理后,比叶面积均极显著升高(P<0.01),且春季刈割比秋季刈割升高幅度更大;叶干物质含量极显著降低(P<0.01),而春季刈割与秋季刈割之间差异不显著(P>0.05);各处理对全碳含量和叶绿素a/b无显著影响(P>0.05);而春季刈割与自然生长和秋季刈割相比,全氮含量、氮磷比、叶绿素a、叶绿素b和总叶绿素含量均极显著升高(P<0.01)。从叶片功能性状对植物适应环境的指示作用分析,刈割可能会造成骆驼刺植被的养分保有能力和资源利用效率下降。但在经济效益方面,秋季刈割会增加骆驼刺的生物量。因此,综合考虑对骆驼刺植被最小程度的破坏以及满足牲畜饲草供应量的要求,推荐秋季刈割作为一种适时利用骆驼刺资源的管理措施。

This study taken Cele oasis at the southern fringe of Taklimakan Desert as the research area,and studied the influence of clipping at different seasons（clipping in spring and clipping in fall）on the leaf functional traits of Alhagi sparsifolia.The results showed that the specific leaf area of A.sparsifoliaincreased obviously after clipping processing（P〈0.01）,and the increased degree was higher for clipping in spring compared with clipping in fall.The dry matter content of leaf decreased significantly（P〈0.01）,while no evident difference between clipping in spring and fall（P〉0.05）.Each treatment had a little influence on the carbon content and chlorophyll a/b.Compared clipping in spring with control and clipping in fall,the indexes of total N content,N∶P,chlorophyll a,chlorophyll b and total chlorophyll content increased significantly（P〈0.05）.By taking the leaf functional traits as an indicator of plant adaption to the environment,we concluded that clipping may cause the declination of the ability to preserve nutrition and the resources use efficiency of A.sparsifolia.However,in terms of economic benefit,clipping in fall can produce a positive effect on the biomass of A.sparsifolia.Therefore,when minimum destruction and livestock forage supply of A.sparsifolia were considered together,we recommend that clipping in fall was recognized as a proper management and use strategy for A.sparsifolia.