基金项目:黑龙江省青年科学基金项目 (QC2009C64)
作者简介:马晓乾( 1979-),男,宁夏人,硕士,助理研究员,从事森林病虫害方面的研究工作;电话: 15145102825; E-mail:369086324@qq.com
通过野外接虫和人工模拟刻槽的方法,对光肩星天牛产卵分泌物对刻槽微生境的影响进行了分析研究。研究结果表明:有效刻槽微生境含水量,在 0~ 7日龄期间均高于对照和人工模拟刻槽含水量,同时呈逐渐向对照含水量接近并趋向平稳, 8~ 9日龄期间与对照含水量基本一致。有效刻槽微生境中 pH值均高于人工模拟刻槽微生境和对照,并呈现一定的波动性。有效刻槽微生境中微生物数量变化,在 0~ 4日龄期间有效刻槽微生境真菌数量低于对照, 4日龄后逐渐与对照真菌数量接近, 5~ 9日龄期间两者基本一致。有效刻槽微生境细菌数量在 0~ 5日龄期间低于人工模拟刻槽和对照, 5~ 6、6~ 9日龄期间分别呈和对照细菌数量接近和基本一致。
The effects of drought stress on leaf gas exchange of four seedlings of Syzygium jambos, Kadsura longipedunculata, Ormosia pinnata and Mangliet iaglauca were studied. The results show that net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) of the four seedlings continuously decreased with increasing drought time. Intercellular carbon dioxide concentration(Ci) of S. jambos decreased, whereas its stomatal limits (Ls) first decreased and then increased, whereas intercellular carbon dioxide concentration(Ci) decreased and then increased, the Ci of K. longipedunculata, O. pinnata decreased followed by an increase; the Ci of M. iaglauca increased and its Ls decreased during drought experiment period. Water use efficiency (WUE) of S. jambos increased and that of other seedlings decreased with increasing drought time. The drought resistance of the four seedlings was evaluated by using principal component analysis, and the order of drought resistance was S. jambos>K. longipedunculata>O. pinnata>M. iaglauca.