中文摘要
树木电指标在评价、预测树木树势及健康状况的研究领域中得到了普遍的认可，但其理论基础研究和实践应用仍有待于进一步研究。本研究着重探讨了树体叶片及干部电容产生的生物学及生理生化学机理，树体电容与树体阻抗间的关系，及在各种胁迫下树木电指标的变化规律。研究发现，叶片电容与单位质量叶片外渗电导率、叶片细胞离子外渗百分率及叶片含水率呈显著的正相关，与单位质量叶片总电导率呈显著负相关，与叶片相对含水率的相关性不显著；干部电容与树木胸径、树皮相对含水率呈显著正相关关系；树体电容与树体阻抗呈显著的负相关关系；树体干部电容与根部电容呈显著正相关关系；在各种胁迫下，树体电容普遍呈减小趋势，而树体阻抗普遍呈增大趋势；利用树体电容0.5nF为阈值，判断马尾松是否感染松材线虫，准确率可达89.26%。本研究为通过叶片电容无损探测量化评价树木受害程度及亏缺水程度提供了理论基础；也为通过树干电容及单位电容量化评价树木长势、抗病性及林分生长状况提供了依据。
英文摘要
It is commonly accepted that it is feasible to assess tree vigor and health conditions by electrical indexes, while the theoretical foundation and practical application of the research are still need further study. Our results showed that the leaf capacitance had significant positive correlations with leaf exosmosis electro conductivity, exosmosis percentage and leaf absolute moisture content, had significant negative correlations with leaf electrolyte electro conductivity and had no correlations with leaf relative water content(RWC); the stem capacitance had significant positive correlations with DBH(diameter at breast height) and bark relative turgidity(RT); tree capacitance had significant negative relationship with tree impedance; stem capacitance had significant positive relationship with root capacitance; under stresses such as disease, drought and intraspecific competition, the decreasing trend of tree capacitance and unit capacitance and increasing trend of tree impedance were showed; the correctness rate could reach 89.26% when 0.5nF threshold of tree capacitance was used to estimate whether the Pinus massoniana Lamb. was infected with Bursaphelenchus xylophilus. So the research of the leaf, stem and unit capacitance would provide a theoretical basis for the quantitative assessment of the degree of dama
结题摘要
树木电指标在评价、预测树木树势及健康状况的研究领域中得到了普遍的认可，但其理论基础研究和实践应用仍有待于进一步研究。本研究着重探讨了树体叶片及干部电容产生的生物学及生理生化学机理，树体电容与树体阻抗间的关系，及在各种胁迫下树木电指标的变化规律。研究发现，叶片电容与单位质量叶片外渗电导率、叶片细胞离子外渗百分率及叶片含水率呈显著的正相关，与单位质量叶片总电导率呈显著负相关，与叶片相对含水率的相关性不显著；干部电容与树木胸径、树皮相对含水率呈显著正相关关系；树体电容与树体阻抗呈显著的负相关关系；树体干部电容与根部电容呈显著正相关关系；在各种胁迫下，树体电容普遍呈减小趋势，而树体阻抗普遍呈增大趋势；利用树体电容0.5nF为阈值，判断马尾松是否感染松材线虫，准确率可达89.26%。本研究为通过叶片电容无损探测量化评价树木受害程度及亏缺水程度提供了理论基础；也为通过树干电容及单位电容量化评价树木长势、抗病性及林分生长状况提供了依据。