磷含量和秸秆添加量对褐土锌吸附—解吸的影响  

Effects of P and Straw Application Rates on Zinc Adsorption & Desorption in Cinnamon Soil

作　　者：刘世亮[1] 陈娇君[1] 王明娣[1] 刘芳[1] 介晓磊[1,2] 化党领[1] 

机构地区：[1]河南农业大学河南省高校农业资源与环境工程技术研究中心,河南郑州450002 [2]黄淮学院,河南驻马店463000

出　　处：《土壤通报》2012年第2期369-373,共5页Chinese Journal of Soil Science

基　　金：河南省自然科学基金项目(0511031400;2008A208014)资助

摘　　要：采用室内培养的方法,通过人为添加不同量的玉米秸秆和磷,研究不同含量磷和作物秸秆对土壤锌吸附—解吸的影响,以探讨磷—锌在土壤中的交互作用机制。结果表明:低锌(Zn10:添加Zn2+浓度为10 mg L-1)条件下,土壤对Zn2+的吸附量随土壤速效磷含量的增加而逐渐降低,表明在石灰性土壤中,随磷含量的增加提高了土壤锌的有效性;而Zn2+的解吸量随土壤中磷含量的增加先升高后降低,添加Zn2+浓度为80 mg L-1(Zn80)条件下,土壤对Zn2+的吸附量明显大于Zn10条件下。土壤中添加不同秸秆量对不同浓度Zn2+吸附时,低锌(Zn10)处理下,在相同磷含量情况下,土壤对Zn2+的吸附量随秸秆添加量的增加而减少,而土壤对Zn2+的解吸量随秸秆量的增加而增加。在不同磷水平下,不同秸秆添加量对Zn2+的吸附趋势差异较大。高锌(Zn80)处理下,土壤对Zn2+的吸附量在不同秸秆量处理下趋势大致相同,且Zn2+吸附量随磷含量的提高先升高后降低;在同一磷水平下,土壤对Zn2+的吸附趋势和Zn10时相似。利用KNO3进行解吸Zn2+时,不添加秸秆和低量秸秆处理变化趋势相同,均在添加磷量为360 mg kg-1时解吸量达到最大,分别为363.5 mg kg-1、424 mg kg-1,而高量秸秆处理下,Zn2+解吸量随磷含量的增加先升高后降低。To elucidate the interaction mechanism of P and Zn in soil system,this study investigated the effects of different rates of phosphorus and straw on Zn2＋ adsorption and desorption in Cinnamon soil.The results showed that the Zn2＋ absorption amount decreased with P content increase in low content Zn treatments（Zn10 treatment）,which indicated that the Zn availability was increased with P content increase;and Zn2＋ desorption amount increased at first and then decreased.And in Zn80 treatment,the Zn2＋ adsorption amount was significantly higher than that of Zn10 treatment.As for different rates of straw addition,in low amount Zn treatment（Zn10 treatment）,the Zn2＋ adsorption amount decreased with straw application rates increase and Zn2＋ desorption amount increased with straw application rates increase under the same P level.But under different P levels,the Zn2＋ adsorption amount was significantly different among all straw application treatments.Under high Zn amount treatments（Zn80 treatment）,the trend of Zn2＋ adsorption was almost the same in different straw application treatments,and Zn2＋ adsorption amount increased at first and then decreased with P content increase.Under the same P level,the trend of Zn2＋ adsorption was the same as Zn10 treatment.When using KNO3 to desorb Zn2＋,the Zn2＋ desorption trend was the same in non-straw treatment and low rates of straw treatment,and the desorption amount reached the maximum at 360 mg kg-1 of P,and the desorption amounts were 363.5 mg kg-1 and 424 mg kg-1,respectively,but in high straw application treatment,Zn2＋ desorption amount increased at first and then decreased with P content increase.

关 键 词：褐土 磷 秸秆 锌 吸附 解吸 

分 类 号：X131.3[环境科学与工程—环境科学]