不同铅浓度下水氮调控对小桐子生长的影响  

Effect of water and nitrogen regulation on growth of Jatropha curcas L.under different concentrations of lead stress

作　　者：王卫华[1] 王亓剑 雷龙海 杨启良[1] 武振中[1] 张志鹏[1] 

机构地区：[1]昆明理工大学现代农业工程学院,云南昆明650500 [2]广西科技大学鹿山学院,广西柳州545000 [3]毕节市水土保持办公室,贵州毕节551700

出　　处：《排灌机械工程学报》2016年第12期1077-1085,共9页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51409136;51379004);云南省应用基础研究面上资助项目(2013FB024);昆明理工大学自然科学研究基金资助项目(KKSY201423023)

摘　　要：为研究铅胁迫下水氮调控对小桐子生长的影响,采用2种灌水水平(W1:50%FC;W2:75%FC)、3种施N方式(N0:0;N1:300 mg;N2:600 mg)、5种土壤Pb污染水平(Pb1:0;Pb2:500mg;Pb3:1 000 mg;Pb4:1 500 mg;Pb5:2 000 mg)交互试验对小桐子的生长进行了分析.试验结果表明:在土壤铅质量比达到Pb4后,铅胁迫占据主导地位,无论灌水量和施氮量如何变化,都显著的抑制小桐子幼树的生长和发育;中度水分胁迫抑制小桐子的生长发育,导致生物量降低,水分利用效率下降;高氮处理促进植物生长的同时,降低土壤的有效铅含量,减小铅对小桐子的抑制作用,水分利用效率增加;处理W2N2的小桐子平均水分利用效率分别比W1N0,W1N1,W1N2,W2N0,W2N1显著提高了54.8%,46.2%,38.4%,27.4%,9.8%.在土壤铅水平不超过Pb4时,W2N2水平较其他水平更能提高小桐子生物量、水分利用效率以及植物修复的效率.An interaction experiment was conducted to study the effect of water and nitrogen control on seedling growth and water use efficiency of Jatropha curcas under lead stress. Two irrigation levels （ W1 ： 50% FC and W2：75% FC） , 3 nitrogen application levels （ NO ：0, N1：300 mg and N2：600 mg） , and 5 Pb pollution levels （ Pbl ：0, Pb2：500 mg, Pb3 ： 1 included. The results show that lead stress was the 000 mg, Pb4 ： 1 500 mg and Pb5：2 000 mg） were dominant factor when the soil lead concentration reached PM, significantly inhibiting the growth and development of Jatropha curcas, regardless of whether the volume of irrigation and nitrogen application varied or not. High nitrogen promoted plant growth and increased water use efficiency, while it reduced the lead content of the soil and extenuated the restraint of effective lead on Jatropha curcas. Moderate water stress inhibited the growth of Jatropha curcas, resulting in a decrease of biomass and water use efficiency. The averaged water use efficiency of Jatropha curcas for W2N2 treatment was 54. 8% , 46.2% , 38.4% , 27.4% and 9.8% higher than for W1N0, W1N1, W1N2, W2N0 and W2N1 treatments, respectively. The results indicate that W2N2 treatment could improve the biomass and water use efficiency of Jatropha curcas and phytoreme- diation efficiency, when soil lead level was not more than PM.

关 键 词：小桐子 铅 水氮调控 水分利用效率 

分 类 号：S210.3[农业科学—农业机械化工程]