| Baesd on field conditions of Longjing43tea trees our study mainly launches in two areas. The First is the research with mining method to study the whole plant on the ground and underground part of tea tree biomass and main content of nutrient elements. The second is using soil in different drilling method in different position, drilled multiple different depth absorption root, preliminary proved the season and root absorbed space distribution. The main results are as follows.(1)The biomass of tea trees of two ages is in the order of stem> root> leaf.The stem is the major part of aboveground trees, makes up80%. and of which more than85%stems distribution in the20cm section. Root biomass with a diameter greater than2cm root, followed by0.2-2cm diameter root.The increasing of biomass of two ages of trees is different. During their one year growth period stem and root of10old lea trees are increasing significantly. The22old tea trees did not change much, and the overall trend of biomass change is in steady state.(2)The carbon storage of tea tree has the same change trend as biomass. The stem is tea tree body the main carbon storage site, occupy the58.9%-65.7%of gross, followed by the root, occupy the22.5-32.9%of gross. After one year of growth, the trees of age of10have a significantly growth of carbon storage in stems and roots, by2010the10.6t/ha and3.67t/ha increased to16.1t/ha and6.14t/ha, increased51.9%and67.3%respectively. The age of22tea tree they have no significant changes carbon storage.(3) Results show that nitrogen, phosphorus and potassium were mainly reserved in the ground, and to stem mainly. The content of N, P, K of10old trees are significantly increasd during the one year growing period, however there was no significantly increasd in22year old trees. N is mainly stored in the upper part, about more than65%. Although N concentration in leaves is higher than in the stem, more than60%of N was in stems. Growth after a year the N content in the stem of was increased significantly of the10old trees, by2010thel92kg/ha increase to407kg/ha. increased1.12times, root nitrogen reserves have increased significantly, increased from95.2kg/ha to149kg/ha, an increase of1.85times. There was no significantly differences of22year old trees. P is also mainly stored in the ground part, occupy the54.0%-69.6%of gross, in which the part on the ground more than65%of the phosphorus storage in stems.Growth after (?)year.stems and roots of P reserves of10old trees intereased significantly."hile22did not show a difference. K stnrage of tea trees has a same changing trend of P. More than60%of K were distributing in upperground. which mainly in stem. Growth after1year, stems and roots of K reserves of10old trees increased significantly, while22did not show a difference.(4) Tea tree root absorb different space position change trend is no significant difference, but still show some of the trend. From June-December sampling on the result analysis, the results showed that aue10tea tree root absorbed biomass horizontal distribution lends to crown margin or near the fertilization furrow distribution ratio increases, root absorbed furrow more than roots. Vertical distribution root absorbed majority(0to20)cm place,and the down layer growth. Tlie22years old tea produces, root began to age. the root absorbed biomass decreased, crown margin reduction ratio.behave as nearly vertled distribution of root growth. vertial distnbutio with the soil increases, root absorbed decreased significantly, root absorbed multidirectional surface (0to10)cm. |
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