【摘要】：植被恢復是既能保持磷礦開采同時又能有效扼制礦區(qū)生態(tài)環(huán)境的退化,并逐步恢復已退化的礦區(qū)生態(tài)系統(tǒng)最有效的生物措施。為揭示植被恢復對昆陽磷礦土壤有機碳和碳素積累的影響,研究探討了昆陽磷礦不同恢復林地的土壤有機碳儲量變化。結(jié)果表明:(1)不同恢復林地的土壤有機碳含量存在顯著差異(p0.05),7種不同植被恢復人工林土壤平均有機碳含量分別是廢棄地的14.29倍、11.83倍、11.40倍、5.89倍、15.48倍、15.59倍、18.53倍。(2)土壤有機碳在剖面的含量表現(xiàn)出明顯的"表聚作用",均以表土層(0—20cm)最大,且隨土層厚度的增加,呈下降趨勢。(3)不同恢復林地的土壤有機碳密度差別較大,變化趨勢和土壤有機碳含量的變化趨勢一致,且在同一林分土壤中,單位深度土壤各土層平均有機碳密度均以表層最大,隨土層的增加而降低。(4)土壤有機碳主要存儲于0—20cm土層中,平均含量為53.60%,隨著土層的加深,土壤有機碳所占比重急劇下降,經(jīng)過植被恢復,7種人工林土壤有機碳儲量較廢棄地0—20cm土壤有機碳儲量提高了26.53%,20.39%,34.48%,10.81%,28.62%,39.52%,36.71%,說明目前礦區(qū)通過植被恢復后的土壤狀況顯著優(yōu)于未進行恢復措施的廢棄地。
[Abstract]:Vegetation restoration is the most effective biological measure which can not only maintain phosphate rock mining, but also effectively curb the degradation of ecological environment in mining area, and gradually restore the degraded mining area ecosystem. In order to reveal the effect of vegetation restoration on soil organic carbon and carbon accumulation in Kunyang phosphate rock, the changes of soil organic carbon reserves in different restored forest land of Kunyang phosphate rock were studied and discussed. The results showed that: (1) there were significant differences in soil organic carbon content among different restored forest lands (p0.05). The average soil organic carbon content of seven different vegetation restoration plantations was 14.29 times, 11.83 times, 11.40 times, 5.89 times, 15.48 times, 15.59 times and 18.53 times higher than that of wasteland, respectively. (2) the content of soil organic carbon in the profile showed obvious "surface accumulation", (2) the soil organic carbon content in the profile was 14.29 times, 11.83 times, 11.40 times, 5.89 times, 15.48 times, 15.59 times and 18.53 times higher than that in wasteland, respectively. The topsoil layer (0-20cm) was the largest, and decreased with the increase of soil thickness. (3) the soil organic carbon density of different restored forest land was quite different, and the change trend was consistent with the change trend of soil organic carbon content, and the average organic carbon density of each soil layer per unit depth was the highest in the same stand soil. It decreased with the increase of soil layer. (4) soil organic carbon was mainly stored in 0-20cm soil layer with an average content of 53.60%. With the deepening of soil layer, the proportion of soil organic carbon decreased sharply. After vegetation restoration, the soil organic carbon storage of seven plantations increased by 26.53%, 20.39%, 34.48%, 10.81%, 28.62% and 39.52%, respectively. 36.71%, indicating that the soil condition after vegetation restoration in mining area is significantly better than that in abandoned land without restoration measures.
【作者單位】： 云南省林業(yè)科學院;
【基金】：國家自然科學基金項目“云南磷礦廢棄地植被修復土壤質(zhì)量演變機理研究”(41361076)
【分類號】：S714.2

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