本文選題：土地整治 + 新增耕地��； 參考：《南方農(nóng)業(yè)學(xué)報(bào)》2016年06期

【摘要】：【目的】以渭北黃土高原溝壑區(qū)為例,研究土地整治中新增耕地的土壤養(yǎng)分特征,為判別新增耕地能否實(shí)現(xiàn)可持續(xù)利用提供參考。【方法】以位于渭北黃土高原溝壑區(qū)的白水、蒲城和富平3縣新增耕地為研究對(duì)象,每20 ha新增耕地作為一個(gè)采樣單元,采集0~30 cm耕層土壤,共采集土樣30個(gè),測(cè)定土壤有機(jī)質(zhì)、全氮、有效磷和速效鉀含量及土樣質(zhì)地等指標(biāo),分析土壤養(yǎng)分狀況。【結(jié)果】渭北黃土高原溝壑區(qū)新增耕地土壤質(zhì)地均為粉壤土,有機(jī)質(zhì)、全氮、有效磷及速效鉀平均含量分別為16.69 g/kg、0.67 g/kg、15.79 mg/kg和173.28 mg/kg;有機(jī)質(zhì)和速效鉀含量表現(xiàn)為白水縣富平縣蒲城縣;全氮含量表現(xiàn)為蒲城縣白水縣=富平縣;有效磷含量表現(xiàn)為白水縣蒲城縣富平縣。相關(guān)性分析結(jié)果表明,土壤有機(jī)質(zhì)含量與全氮含量呈顯著正相關(guān)(P0.05),與有效磷、速效鉀含量呈極顯著正相關(guān)(P0.01,下同);有效磷含量與速效鉀含量呈極顯著正相關(guān)。除全氮外,其他土壤養(yǎng)分含量與砂粒含量呈正相關(guān),與黏粒和粉粒含量呈負(fù)相關(guān)。參照黃土高原養(yǎng)分分級(jí)指標(biāo)對(duì)渭北黃土高原溝壑區(qū)新增耕地的土壤養(yǎng)分進(jìn)行分級(jí)評(píng)價(jià),土壤有機(jī)質(zhì)含量整體處于中等水平,全氮含量較低,有效磷和速效鉀含量較高。【結(jié)論】渭北黃土高原溝壑區(qū)不同采樣縣新增耕地土壤養(yǎng)分存在地區(qū)差異性。土壤有機(jī)質(zhì)含量對(duì)土壤養(yǎng)分含量影響較大。
[Abstract]:[objective] taking the gully region of Weibei Loess Plateau as an example, to study the soil nutrient characteristics of the new cultivated land in land regulation, and to provide a reference for judging whether the new cultivated land can be used for sustainable use. [methods] White water located in the gully region of Weibei Loess Plateau. The new cultivated land in Pucheng and Fuping counties was studied. Every 20 ha of newly increased cultivated land was used as a sampling unit to collect 030 cm soil layer, 30 soil samples were collected, and soil organic matter and total nitrogen were determined. The content of available phosphorus and available potassium and soil texture were analyzed. [results] the soil texture of the new cultivated land in the gully region of Weibei Loess Plateau was silt loam, organic matter and total nitrogen. The average contents of available phosphorus and available potassium were 16.69 g / kg ~ 0.67 g / kg ~ (-1) mg/kg and 173.28 mg / kg 路kg ~ (-1), respectively. The content of available phosphorus was expressed in Fuping County, Pucheng County, Baishui County. The results of correlation analysis showed that there was a significant positive correlation between soil organic matter content and total nitrogen content (P0.05N), and a very significant positive correlation between soil organic matter content and available phosphorus content, and a very significant positive correlation between available potassium content and available phosphorus content (P 0.01), and between available phosphorus content and available potassium content. Except for total nitrogen, soil nutrient content was positively correlated with sand content, negatively correlated with clay and silt content. According to the nutrient grading index of Loess Plateau, the soil nutrients of the newly increased cultivated land in the gully region of Weibei Loess Plateau were evaluated. The content of soil organic matter was in the middle level, and the total nitrogen content was low. [conclusion] there are regional differences in soil nutrients of newly cultivated land in different sampling counties in the gully region of Weibei Loess Plateau. The content of soil organic matter has great influence on soil nutrient content.
【作者單位】： 陜西省土地工程建設(shè)集團(tuán)有限責(zé)任公司/國(guó)土資源部退化及未利用土地整治工程重點(diǎn)實(shí)驗(yàn)室;西北農(nóng)林科技大學(xué)資源環(huán)境學(xué)院;
【基金】：國(guó)家科技支撐計(jì)劃項(xiàng)目(2014BAL01B03)
【分類號(hào)】：S158

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