本文選題：外源鉛 + 有機碳　； 參考：《干旱地區(qū)農業(yè)研究》2017年04期

【摘要】：以關中土為供試土樣進行田間試驗,向耕層土壤中添加不同濃度外源鉛(Pb0:背景值,CK;Pb1:175 mg·kg~(-1)+背景值;Pb2:350 mg·kg~(-1)+背景值),進行小麥—玉米輪作試驗。分別于2011—2013年小麥收獲季采集耕層(0~20 cm)土壤,分析土壤中鉛全量及有效態(tài)鉛含量的年際變化,以及鉛對小麥-玉米輪作模式下土壤有機碳(SOC)、溶解性有機碳(DOC)、微生物量碳(MBC)、堿解氮、速效磷、速效鉀含量的影響。結果表明,三年中,施鉛處理下土壤中鉛全量及有效態(tài)鉛含量分別下降13.22%和30.65%,總體呈現逐年下降趨勢。與對照(CK)相比,Pb1、Pb2處理下SOC平均含量分別下降了16.30%和11.86%;DOC平均含量分別下降了4.05%和7.34%,與土壤鉛含量呈現顯著負相關關系;低濃度鉛污染下土壤微生物商(q M)顯著高于對照土壤,微生物量碳含量變化不顯著。此外,土壤速效養(yǎng)分的分析顯示,土壤堿解氮含量在外源鉛加入初期下降明顯,且在Pb1處理下堿解氮減少量最大;土壤速效磷含量隨土壤鉛含量增加而呈現下降趨勢;土壤速效鉀含量則隨土壤鉛含量的增加而增加。試驗表明,外源鉛的加入影響了土壤有機碳的穩(wěn)定性,對土壤碳、氮循環(huán)產生了一定的影響;能夠與土壤溶液中的磷酸根生成難溶性鹽,與土壤膠體或土壤礦物晶格中的K+發(fā)生置換,加大土壤速效養(yǎng)分的流失風險。
[Abstract]:The field experiment was carried out with Guanzhong soil as the sample soil sample, and different concentrations of exogenous lead (Pb0: background value, CK, Pb1:175 mg. Kg~ (-1) + background value, Pb2:350 mg. Kg~ (-1) + background value) were added to the soil, and the wheat maize rotation experiment was carried out. The soil of the plough layer (0~20 cm) was collected from the harvest season of 2011 to 2013, and the total amount of lead in the soil was analyzed and the total amount of lead was analyzed. The interannual variation of effective lead content and the effect of lead on soil organic carbon (SOC), dissolved organic carbon (DOC), microbial biomass carbon (MBC), alkali hydrolysable nitrogen, available phosphorus and available potassium in the wheat maize rotation model. The results showed that in the three years, the total lead and effective lead content in soil soil decreased by 13.22% and 30.65% respectively in the three years. Compared with the control (CK), the average content of SOC decreased by 16.30% and 11.86% under the treatment of Pb1 and Pb2, and the average content of DOC decreased by 4.05% and 7.34% respectively. The soil lead content was negatively correlated with the soil lead content, and the soil microorganism merchant (Q M) was significantly higher than the control soil under the low concentration of lead pollution, and the change of microbial biomass carbon content was not significant. In addition, the analysis of soil available nutrients showed that the content of soil alkali hydrolysable nitrogen decreased obviously in the early stage of adding exogenous lead, and the decrease of alkali hydrolysable nitrogen was the largest under the treatment of Pb1, and the content of soil available phosphorus decreased with the increase of soil lead content, and the content of soil available potassium increased with the increase of soil lead content. It affects the stability of soil organic carbon and has a certain influence on soil carbon and nitrogen cycle. It can produce insoluble salts with phosphoric acid roots in soil solution, and replace the K+ in the lattice of soil colloid or soil mineral, and increase the risk of soil quick acting nutrient loss.
【作者單位】： 西北農林科技大學資源環(huán)境學院農業(yè)部西北植物營養(yǎng)與農業(yè)環(huán)境重點實驗室;
【基金】：公益性行業(yè)(農業(yè))科研專項“主要農產品產地土壤重金屬污染閾值研究與防控技術集成示范”(200903015)
【分類號】：S153.6;S158

【相似文獻】

相關期刊論文 前10條

1 車梅蘭;;內蒙古科左后旗耕地速效養(yǎng)分評價[J];農業(yè)與技術;2014年04期

2 周長華;;炕土肥的施用[J];農村科學實驗;1994年02期

3 楊寶平;陳兵林;周治國;孟亞利;王友華;賈志寬;海江波;;施氮量對棉田土壤速效養(yǎng)分和酶活性變化特征的影響[J];灌溉排水學報;2012年06期

4 ;施用“五四○六”菌肥對根際微生物區(qū)系及速效養(yǎng)分變化的影響[J];遼寧農業(yè)科技;1972年02期

5 季之本;;院土的肥料價值[J];中國農業(yè)科學;1957年08期

6 王小龍;噴灌條件下沙土地速效養(yǎng)分移動特性研究[J];河南職技師院學報;2001年04期

7 劉楠,朱永法;老墻土為什么有肥效?[J];新農業(yè);1984年12期

8 張少良;張興義;于同艷;隋躍宇;高崇升;;哈爾濱市轄區(qū)黑土速效養(yǎng)分空間異質性分析[J];土壤通報;2008年06期

9 盧普相,羅蓮香,袁彩庭,張美興;植稻期水稻土速效養(yǎng)分動態(tài)的數學模式[J];熱帶亞熱帶土壤科學;1998年03期

10 黃飛;;積造糞肥的質量標準[J];農村科學實驗;2008年08期

相關碩士學位論文 前2條

1 溫國梁;沼液施用對濱海鹽堿地水稻和小麥生長以及土壤性狀的影響[D];南京林業(yè)大學;2016年

2 韓瑋;還田秸稈配施外源酶效應研究[D];山東農業(yè)大學;2006年

，

本文編號：2073394