豫东平原农杨复合生态系统胁地现象及其克服技术研究

The Negative Effect and Its Ameliorating Treatments of Agro-Populus Ecosytem in Eastern Plain of Henan Province

通过对商丘市民权林场2种农杨间作模式不同胁地克服技术(覆膜法、切根法)处理下植物的株高、分蘖数、叶绿素含量、地上生物量等的调查测定,分析了不同模式下的胁地规律与不同胁地克服技术处理的效果。结果表明,林带乔木树种对植物各指标具有一定的胁地效应,胁地主要表现为乔木树冠的影响;但由于所测定的间作植物均具有一定的耐荫性,各指标的胁地现象并不十分典型,其中胁地对植株的高度、分蘖数影响较小,对叶绿素含量、生物量的影响相对较大,并表现出一定的"北胁南不胁"现象;显著性检验结果表明,2种胁地处理技术与对照在部分指标上有一定的差异,其中以切根法的处理效果较好。

Based on the investigation of plant height, tiller number, chlorophyll content and aboveground biomass in two different Populus shelter belts with different treatment for negative shading effect in state forest farmland in Minquan,Shangqiu city, the paper analyzed the shading effect and its treatment method. The result showed that there was a negative effect of tree on in- tercropping plant within the shelter belt, with the main effect owing to the crown shading of trees. However, the effect was not so typical in two belts because of the shade tolerance of inter- cropping plants. The effect on plant tiller number and plant height was smaller than on chloro- phyll content and aboveground biomass,and also showed a phenomena of ＂shading on northern is severer than on southern＂. The significant test showed that there was a difference among treat- ments and the check,and within the two treatment methods; the root cutting method had a better ameliorating effect.