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生物炭对林地土壤团聚体稳定性与肥料氮分布的影响
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作者 张伟婷 郭宇轩 +2 位作者 魏圆慧 贾广昊 毛艳玲 《福建农业学报》 CAS CSCD 北大核心 2024年第3期345-353,共9页
【目的】林地土壤抗侵蚀能力、渗透性及保水性与土壤团聚体结构稳定性紧密相关,氮素的固持与分布直接影响林下植被生长与林地土壤团聚体形成。研究生物炭添加对林地土壤结构稳定性与残留氮素分配的影响,可为增强林地土壤团聚体稳定性、... 【目的】林地土壤抗侵蚀能力、渗透性及保水性与土壤团聚体结构稳定性紧密相关,氮素的固持与分布直接影响林下植被生长与林地土壤团聚体形成。研究生物炭添加对林地土壤结构稳定性与残留氮素分配的影响,可为增强林地土壤团聚体稳定性、提高土壤氮素固持水平提供参考。【方法】利用福建省林地土壤进行盆栽试验(1年),设置4个处理:对照(CK)、化肥(F)、木炭+化肥(MC)、秸秆炭+化肥(JC),除CK外,化肥及生物炭处理均每盆施用尿素1 g、过磷酸钙2.19 g、氯化钾0.44 g,追肥^(15)N-尿素,共追施5 g,生物炭施用量为每盆140 g。测定不同处理土壤团聚体组成、团聚体稳定性指标、团聚体氮素含量与分布,结合^(15)N示踪技术分析肥料氮在土壤团聚体内的残留特点,揭示生物炭对林地土壤团聚体稳定性与氮素分配的影响。【结果】(1)与F处理相比,MC与JC处理显著提高了土壤大团聚体含量,其中>2 mm土壤团聚体增幅最大,分别增长了108.92%与119.11%;(2)施用生物炭增强了土壤团聚体稳定性,MC与JC处理平均重量直径(MWD)、几何平均直径(GMD)及>0.25 mm大团聚体含量(R>0.25 mm)较F处理均显著提升,分形维数值(D)显著下降,JC处理土壤团聚体稳定性优于MC处理;(3)施用生物炭提高了不同粒径土壤团聚体中全氮含量,MC处理土壤全氮总量高于JC处理,二者的>2 mm团聚体氮素贡献率较F处理分别显著增加了38.09%与69.10%;(4)施用生物炭使>0.25~2 mm粒级团聚体δ^(15)N富集,MC与JC处理土壤肥料氮残留量以>0.25 mm粒级最多,较F处理显著增加了2.25倍与3.89倍,土壤大团聚体中氮肥残留量与团聚体稳定性呈显著正相关。【结论】施用生物炭有利于增强林地土壤团聚体稳定性,减少土壤氮素与肥料淋失,肥料氮在大团聚体中的固持高于微团聚体,秸秆炭对土壤团聚体稳定性提升效果更显著,木炭施用更有利于土壤氮素含量增加。 展开更多
关键词 生物炭 团聚体稳定性 氮肥利用 15N标记 林地土壤结构
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Impact of Demographic Structure on Paddy and Forestland Management
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作者 LI Tiehua XIANG Wenhua XU Guozhen ZENG Guangzheng 《Chinese Forestry Science and Technology》 2006年第1期86-92,共7页
In order to understand the impact of demographic structure on paddy and forestland managementafter the convening of the Third Plenary Session of the 11th CPC (Communist Party of China) CentralCommittee and the impleme... In order to understand the impact of demographic structure on paddy and forestland managementafter the convening of the Third Plenary Session of the 11th CPC (Communist Party of China) CentralCommittee and the implementation of the Household Responsibility System (the government divided upland among peasants for cultivating and the peasants sell a set part of their produced goods to thegovernment at stipulated prices by contract in the countryside of China), 147 households in 6 villages,belonging to Xiangtan County and Zhuzhou County in Hunan Province, were selected as research samples,and interview, questionnaire survey and second hand data analyzing were used as the methods. The resultsshowed: Persons with different ages had different ideas, and young peasants would like to work in townsor cities for more income, so they used and depended on land less; In terms of sex, the male was still themain user of land, and therefore the ability, idea and activity of male played an important role in landmanagement; Generally, the labors with better educational background grasped more knowledge andtechnologies, and they had more opportunity to get jobs and had better working condition and moreincome in town or cities, so they depended on and used land less. 展开更多
关键词 demographic structure paddy and forestland management age structure sex structure educational background China
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