不同立地条件下杨树树冠结构与溃疡病的关系
Relationship between crown structure of poplar and poplar canker in different site conditions
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摘要: 调查了不同立地条件下的杨树树冠结构和溃疡病的病情，分析了立地条件对树冠结构的影响以及树冠结构与溃疡病病情的关系。结果表明：树冠表面积（CSA）与土壤类型、土层厚度、腐殖质层厚度均呈极显著正相关；单株总叶面积（TLA）只与土壤类型呈显著正相关；冠幅（W）与土壤类型呈极显著正相关，与腐殖质层厚度呈显著正相关；枝下高(Hub)与土层厚度呈极显著正相关，与腐殖质层厚度呈显著正相关。杨树溃疡病病情与树冠结构密切相关：病情指数与W、冠长树高比（PLCH）、CSA呈极显著负相关，与TLA呈显著负相关。各树冠结构指标对病情指数的直接作用如下：正向作用由大到小的顺序为叶面积指数（LAI）、冠形率（CSR）、W、TLA、一级分枝粗度（Dfb）；负向作用由大到小的顺序为PLCH、冠层密度（CLD）、CSA、Hub、一级分枝角度(Afb)。但从决策系数来看，对病情有抑制作用的各树冠结构指标的相对重要性由大到小的顺序为LAI、CLD、PLCH、W、CSR、TLA、Hub、Dfb。综合考虑各树冠结构指标与溃疡病和立地条件的关系，W对溃疡病的相对重要性适中，且与立地条件呈显著正相关，与杨树溃疡病病情呈极显著负相关。因此,应以W作为溃疡病立地控制的主要树冠结构指标，选择立地条件好（壤土、腐殖质层厚）的造林地或通过施肥等措施，调控冠幅使溃疡病病情控制在一个较低的水平，保持杨树林的生态平衡和经济效益的稳定。Abstract: We surveyed crown structure of poplar and disease state of poplar canker in different site conditions，and analyzed the effects of site conditions on crown structure and the relation of crown structure with disease state of poplar canker. The results showed that crown surface area(CSA) had very significantly positive correlations with soil types, thickness of soil layer and humus layer; and total leaf area(TLA) had a significantly positive correlation only with soil types. The correlation of crown width(W) with soil types and thickness of humus layer respectively was very significantly positive and significantly positive; the correlation of height under branch(Hub) with thickness of soil layer and humus layer respectively was very significantly positive and significantly positive. Besides, disease state of poplar canker and crown structure were very closely related. Disease index was very significantly, negatively correlated with W, percentage of crown length with height(PLCH) and CSA, and was significantly, negatively correlated with TLA. The order of positive direct effect of crown structure indices on disease index was LAI, CSR, W, TLA and Dfb, and the order of negative direct effect of crown structure indices on disease index was PLCH, CLD, CSA, Hub and Afb. But from decision coefficient, the order of the significance of crown structure indices to disease index was LAI, CLD, PLCH, W, CSR, TLA, Hub and Dfb. Considering comprehensively the relation of crown structure indices with site condition, crown width should be considered as the major index of crown structure for site control of poplar canker because of the moderate significance of crown width to disease index of poplar canker, the significantly positive correlation of crown width with site condition and the very negative correlation of crown width with disease index of poplar canker. So the measures of the choice of better planting site(loam, thick soil layer and humus layer) or fertilization can be taken to regulate crown width for controlling the disease state of poplar canker under a low level and to keep the ecological balance and the stabilization of economic benefit of poplar forests.
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Keywords:
- site conditions /
- poplar /
- crown structure /
- poplar canker /
- disease index
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期刊类型引用(5)
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4. 李贤军，张璧光，李文军，周永东. 木材微波真空干燥过程的数学模拟. 北京林业大学学报. 2008(02): 124-128 . 本站查看
5. 李贤军，吴庆利，姜伟，张璧光. 微波真空干燥过程中木材内的水分迁移机理. 北京林业大学学报. 2006(03): 150-153 . 本站查看
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