Effects of tending practices on the nutrient movement for a artificial stands

抚育措施对人工林养分运动的影响

基本信息

批准号：
60480062
负责人：
HAIBARA Kikuo
金额：
$ 2.82万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60480062/
关键词：
Soil solution Nutrient discharge Fertilization Pruning 物質循環地力養分動態人工造林地

项目摘要

The amounts of organic matter and nutrients supplied by weeding and pruning were large and seemed to play an important role in nutrient cerculation and site productivity before crown closure in the young stand. Evapotranspiration by weeds was estimated to be high in the young stand before crown closure and water loss(precipitation-discharge) after pruning decresed to about one-fourth that before pruning. The effects of fertilization on the quality of stream water occurred only during the period directly after clearcutting. There was a positive relationship between stream nutrient content and stream discharge except for the one to three years after pruning. It is important to prevent excess stream discharge and the subsequent loss of nutrients.There were maintained mutural balance between the rate of exchangeable cations in soil and that of soil solution(suction at pF4.2). In case of increase of No3-N concentration in soil solution by fertilization included nitrogen, exhangeable K, Ca and Mg in soil were eluted into soil solution in order to keep the electrical equivalent.Downward movement of fertilezed NO_3-N and K were easy in the lower part where was thick of A horizon and leaching-water amount of Ca and Mg were increased accompanied with increase of NO3-N in soil-water. Otherwize, downward movement of NO_3-N and K were not much in the upper part where was thin of a horizon. Especially, K was held almost in the surface horizon.Movement of fertilized NO_3-N and K to the lower horizon was small quantity in the upper part with general precipitation and their elements were held in soil-water that was absorption some stronger force.

除草和修剪提供的有机物和营养量很大，并且在年轻架子中冠冕之前，似乎在养分候选和现场生产力中起着重要作用。据估计，在修剪到修剪之前的脱骨前至四分之一之后，杂草的蒸散量估计在牙冠闭合和水分流失（降水 - 分离）之前，在年轻的林分中含量很高。受精对溪流质量的影响仅在清除后直接发生。溪流养分含量和流排出之间存在正相关关系，除了修剪后的一到三年。重要的是要防止过量流出并随后的养分损失。在土壤中可交换阳离子的速率和土壤溶液的阳离子速率之间保持了互惠平衡（PF4.2的吸力）。如果通过受精在土壤溶液中NO3-N浓度升高的情况下，包括氮，将土壤中的可振动K，Ca和Mg洗脱到土壤溶液中，以保持电气等效。下部的下部是地平线厚的，浸出水量的Ca和mg增加，伴随着土壤水中NO3-N的增加。 NO_3-N和K的向下移动在地平线很薄的地方并不多。特别是，k几乎保持在地平线上。受精的NO_3-N和K到较低的地平线的移动在上部很少，其一般降水量很小，它们的元素被固定在土壤水中，吸收了一些更强的力。