川西稻田改为茶园后土壤pH和腐殖质组成剖面分布变化特征

发布时间：2018-01-11 23:17

本文关键词：川西稻田改为茶园后土壤pH和腐殖质组成剖面分布变化特征　出处：《浙江农业学报》2016年01期 　论文类型：期刊论文

【摘要】：为了探讨稻田及由稻田改造的茶园这2种土地利用方式下,土壤p H和腐殖质组成的剖面分布特征,按等间距采样法采集土样,分析各土层p H、腐殖质总碳及其组分含量。结果表明:(1)稻田和茶园土壤均呈酸性至强酸性反应,植茶加剧了土壤的酸化;(2)稻田和茶园土壤腐殖质总碳及其组分含量自上而下均呈递减趋势,且剖面分布特征与土地利用和植物根系分布密切相关,在稻田30 cm以下土层中显著降低,在茶园0—60 cm土层内缓慢降低;(3)稻田改为茶园,有利于土壤腐殖质总碳(C_T)、腐殖酸碳(C_(HA+FA))和富里酸碳(C_(FA))的形成与积累,而胡敏酸碳(C_(HA))和胡敏素碳(C_(HM))含量因土层不同而有差异,在0—30 cm土层内不利于其积累,但在40—60 cm土层内表现出明显的积累特征;(4)各土层C_(FA)/C_T和C_(HA+FA)/C_T表现为茶园稻田,C_(HM)/C_T为稻田茶园;而C_(HA)/C_(FA)和C_(HA)/C_T因土层不同而有异,0—30 cm范围内表现为稻田茶园,而40—60 cm范围内表现为茶园稻田;(5)土壤p H越低,腐殖质总碳及其各组分含量越高;反之,腐殖质总碳及其各组分含量越高,p H越低。
[Abstract]:In order to study the profile distribution of soil pH and humus composition in paddy field and tea garden modified by paddy field, soil samples were collected and analyzed according to the equal interval sampling method. The results showed that the soil of rice field and tea garden showed acidic to strong acid reaction, and the acidification of soil was aggravated by planting tea. (2) the total carbon and its components of soil humus in paddy field and tea garden decreased from top to bottom, and the profile distribution was closely related to land use and plant root distribution. It decreased significantly in the soil layer below 30 cm in paddy field and slowly in the 0-60 cm soil layer of tea garden. 3) the transformation of paddy field into tea garden is beneficial to the formation and accumulation of total humus C _ (C) C _ (T _ (1)), humic acid carbon (C _ (C) C _ (1)) and C _ (+) C _ (+) C _ (1) and C _ (1) F _ (F _ (1)). However, the contents of Hu Min and HMN were different in different soil layers, which were not conducive to their accumulation in 0-30 cm soil layer. But in 40-60 cm soil layer, there were obvious accumulation characteristics. (4) in each soil layer, Che / fa / CT and C\ + +\% HA\% FA)/C_T showed as a tea field / / C\ + T\%\%\%\%\\%\\\. And in the range of 0-30 cm between the different layers of soil layer and the scale of Che / C / C / C / C / C / T, there is a rice field tea garden. However, the rice field of tea garden appeared in the range of 40-60 cm. (5) the lower the soil pH, the higher the content of total humus carbon and its components. On the contrary, the higher the content of humus total carbon and its components is, the lower the humus content is.
【作者单位】：四川农业大学资源学院;
【基金】：国家自然科学基金(41371230;40801079)
【分类号】：S571.1;S153
【正文快照】： 土壤p H是土壤最基本的化学性质之一,受成土母质、生物气候、人为活动等成土条件控制,也受土壤有机质含量和类型等影响[1]。土壤p H对土壤中的氧化-还原、溶解-沉淀、吸附-解吸和配合反应起支配作用,在元素的释放、迁移、固定,植物生长和微生物活动中起重要作用。土壤腐殖质是

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