【作者】 曲天竹；

【导师】 孙向阳；

【作者基本信息】 北京林业大学 ， 土壤学， 2008， 硕士

【摘要】 三倍体毛白杨是我国近年来发展迅速的树种之一,研究其叶片营养特性与林地养分动态对提高人工林的营养管理水平具有重要意义。本文研究了三倍体毛白杨林地养分动态变化规律;对三倍体毛白杨叶片营养进行诊断分析;运用多元回归分析方法,研究叶片营养元素含量与林木生长的相关关系;研究了三倍体毛白杨叶片营养与土壤营养的回归关系,从而为三倍体毛白杨的科学管理提供依据,进一步推动三倍体毛白杨产业的快速与可持续发展。本项研究获得的主要结果如下:①三倍体毛白杨11个无性系(无性系号分别为S1、S2、S3、S4、S5、S6、S7、S8、S9、S11、S12)以及1个二倍体毛白杨(无性系号为S10)间叶片N、K、Ca元素含量差异均达到了极显著水平。②同一营养元素在三倍体毛白杨不同无性系叶片中表现出大体相似的季节性动态变化趋势。③从林木生长与叶片营养的偏相关系数大小来看,影响无性系S10人工林胸径生长的主要是叶片中的N、K、Ca元素含量,而影响树高生长的主要是叶片中K、N、Ca元素含量;在无性系S11人工林中,影响胸径生长的主要是叶片中的N、K、Ca、Fe元素含量,影响树高生长的影响树高生长的营养元素按影响程度依次为N、Ca、Fe、K、P。④三倍体毛白杨林地养分动态规律初步研究表明:林地土壤碱性不断加强,土壤有机质和土壤全氮营养状况发生轻度消耗现象,土壤速效磷和速效钾营养状况并非发生明显消耗现象。⑤三倍体毛白杨叶片营养与土壤营养的回归分析表明:无性系S11叶片不同营养元素与土壤营养之间的回归相关性不一。叶片中N、P营养元素的回归相关系数达极显著水平。随着三倍体毛白杨林龄的增加,土壤中N、P营养元素供应水平对三倍体毛白杨叶片中N、P营养水平影响更大,同时其相关关系呈正相关。无性系S11叶片K营养元素含量与土壤中K营养元素的回归相关系数不存在显著回归相关。本项研究的创新点主要体现在:通过对三倍体毛白杨不同无性系叶片营养特性分析,初步拟定了三倍体毛白杨叶片营养诊断标准;通过对三倍体毛白杨林地养分动态变化规律探究,掌握了林地养分消耗状况;分析了三倍体毛白杨叶片营养与土壤营养的回归关系,建立起叶片营养与土壤营养的回归预测模型。更多还原

【Abstract】 Triploid Populus tomentosa is one of the dominant tree species developed quickly in recent years in China. It is important to study the nutrient characteristic in leaf and nutrient dynamic in forest land of triploid Populus tomentosa in order to improve the ability of plantation nutrient management. We studied the nutrient variation orderliness of triploid Populus tomentosa forest land. And carried on the diagnostic analysis on the leaf nutrition .Applied the multiple regression analysis approach to study the correlativity of nutrient content in leaf and the growth of forest . Studied the regression relations between leaf nutrition and soil nutrition of triploid Populus tomentosa , which offered scientific management for triploid Populus tomentosa and promoted the development of the triploid Populus tomentosa industry faster .The main results were as follows:①The difference of N,K,Ca content all reached extremely significant in leaf of eleven clones of triploid Populus tomentosa (S1,S2,S3,S4,S5,S6,S7,S8,S9, S11,S12)were studied with duple Populus tomentosa (S10).②The same nutrient in the triploid Populus tomentosa leaves showed broadly similar seasonal variation trend.③According to the partial correlation coefficient between the growth of forest and leaf nutrient , the N,K,Ca content in leaf of clone S10 affected the growth of breast-height diameter mostly, and influenced the growth of tree height were K,N,Ca content. The N,K,Ca,Fe content in leaf of clone S11 affected the growth of breast-height diameter mostly, and the nutritive elements of influencing the growth of tree height are in turn N, Ca, Fe, K, P.④The preliminary study of triploid Populus tomentosa forest land nutrient dynamic indicate: The forest land soil alkalinity strengthens unceasingly. The soil nutritional status has the mild degenerated phenomenon. The soil entire nitrogen, the fast-acting phosphorus, the fast-acting potassium nutritional status has the obvious degenerated phenomenon by no means.⑤The regression analysis of triploid Populus tomentosa leaf nutrition and the soil nutrition indicated: The return relevance of clone S11 between the leaf different nutritive elements and the soil nutrition’s varied. The return correlation coefficient of N,P content in leaf reached the extremely remarkable level. Along with age of forest increase, the influence of the supply level about N,P content in soil to the nutritional level about N,P in leaf is bigger. However, the correlation coefficient of clone S11 K content in leaf and K content in soil hasn′t the remarkable relation.The following contents belonged to new ideas in this paper: We drawn up the leaf nutrition diagnosis standard initially through analysis the nutrient characteristic of leaf in the different clones of triploid Populus tomentosa. We knew the forest land nutrient consumption condition through inquired into the forest land nutrient tendency change rule .We analyzed the leaf nutrition and the soil nutrition return relations of triploid Populus tomentosa, and established the leaf nutrition and the soil nutrition return forecast model.更多还原