淹水培养下紫云英对紫潮泥锌有效性及形态转化的影响  

Effect of Chinese Milk Vetch on zinc availability and transformation in purple tidal mud soil under waterlogged incubation conditions

作　　者：杨曾平[1] 饶中秀 李万明 谢坚[1] 李海露[1] 褚飞[1] YANG Zeng-ping;RAO Zhong-xiu;LI Wan-ming;XIE Jian;LI Hai-lu;CHU Fei(Hunan Soil and Fertilizer Institute,Changsha Hunan 410125)

机构地区：[1]湖南省土壤肥料研究所,湖南长沙410125

出　　处：《中国土壤与肥料》2024年第7期143-152,共10页Soil and Fertilizer Sciences in China

基　　金：国家自然科学基金联合基金项目(U21A20294);湖南省自然科学基金面上项目(2019JJ40168)。

摘　　要：采用90d的紫云英室内培养试验,探究了石灰性水稻土紫潮泥锌(Zn)有效性及形态转化对不同紫云英添加量的响应。结果表明:添加紫云英促进了紫潮泥中难以被植物吸收利用的矿物残渣态锌(Min-Zn)和氧化锰结合态锌(OxMn-Zn)、潜在有效的碳酸盐结合态锌(Carb-Zn)向易被植物吸收利用的松结有机态锌(Wbo-Zn)和交换态锌(Ex-Zn)转化,从而提高紫潮泥Zn的生物有效性。在整个研究期间,紫潮泥Zn平均转化比率T1处理(添加1.50t/hm^(2)紫云英)最低(-116.40%),T2处理(添加2.25t/hm^(2)紫云英)最高(-19.57%)。到试验结束,添加紫云英处理均提高了紫潮泥Zn转移因子,T2处理最高(1.56%);降低了Zn分配指数,T2处理最低(96.9%);表明紫潮泥土壤Zn向有效态组分发生了转化。不同紫云英添加量处理中,紫潮泥Zn有效性和形态转化之间存在差异,2.25t/hm^(2)紫云英添加量最有利于紫潮泥Zn有效性的提高。研究结果将为以种植紫云英绿肥为手段提高紫潮泥Zn的有效性提供科学依据。A 90-day indoor incubation experiment was conducted to investigate the response of zinc(Zn)availability and form transformation in purple tidal mud soil of calcareous paddy soil to different amounts of Chinese Milk Vetch added.The results showed that the conversion of mineral residual Zn(Min-Zn)and manganese oxide bound Zn(OxMn-Zn),which were difficult to be absorbed and utilized by plants,as well as potentially effective carbonate boundZn(Carb-Zn),to loosely bound organic Zn(Wbo-Zn)and exchangeable Zn(Ex-Zn)that were easily absorbed and utilized by plants,were promoted.Thereby improving the bioavailability of Zn in purple tidal mud soil.The average conversion ratio of Zn of purple tidal mud soil was the lowest in T1 treatment and the highest in T2 treatment throughout the entire study period.By the end of the experiment,the Zn transfer factor of purple tidal mud soil was increased and the Zn allocation index of purple tidal mud soil was decreased with the addition of Chinese Milk Vetch,which indicating that the Zn of purple tidal mud soil had transformed into an effective component.There were differences in the effectiveness and morphological transformation of Zn in purple tidal mud soil with different amounts of Chinese Milk Vetch added.The optimal addition amount of Chinese Milk Vetch was 22500 kg/hm^(2).The research results could provide scientific basis for improving the effectiveness of Zn in purple tidal mud soil by planting Chinese Milk Vetch as green manure.

关 键 词：锌形态 紫云英 紫潮泥 水稻土 腐解 

分 类 号：S142[农业科学—肥料学]