【摘要】：以干旱區(qū)瑪納斯河流域扇緣帶為研究區(qū),分析了花花柴(Karelinia caspia)、霧冰藜(Bassia dasyphylla)、梭梭(Haloxylon ammodendron)和檉柳(Tamarix ramosissima)4個典型鹽生植物群落土壤團聚體的組成及有機碳分布。研究表明:不同植物群落土壤團聚體均以0.25—0.053 mm粒徑為主,占了46.7%—74.6%,且與其他粒徑差異顯著(P0.05),0.25 mm和0.053mm粒徑土壤團聚體含量較少,僅占7.8%—43%。梭梭群落0.25 mm團聚體平均含量較高,達32%。不同植被群落土壤總有機碳介于2.01—8.73 g/kg之間,不同粒徑團聚體有機碳介于1.70—13.68 g/kg之間。不同群落之間,梭梭和檉柳群落總有機碳和團聚體有機碳含量均相對較高,且隨著土層深度下降而下降。不同粒徑之間,有機碳含量在0.25—0.053 mm粒徑最低,在0.25 mm和0.053 mm粒徑中最高,呈現(xiàn)"V"型分布且差異顯著(P0.05)。0.25—0.053 mm團聚體中有機碳含量的貢獻率最高,達43.43%,而0.053 mm粒級貢獻率較低,但有機碳含量較高,說明了小粒徑團聚體對有機碳保護能力較強。土壤有機碳含量與0.25—0.053 mm團聚體含量呈顯著負相關(P0.05)。而從整體來看,梭梭群落0.25 mm團聚體比例較高,且土壤有機碳和團聚體有機碳含量也較高,說明了在該研究區(qū),梭梭群落聚集土壤養(yǎng)分能力較強,相對其他群落更有利于土壤有機碳的積累。
[Abstract]:Taking the fan edge zone of Manas River Basin in arid area as the study area, the composition and organic carbon distribution of soil aggregates in four typical halophytic plant communities, (Bassia dasyphylla), Haloxylon ammodendron (Haloxylon ammodendron) and Tamarix (Tamarix ramosissima), were analyzed. The results showed that the diameter of soil aggregates in different plant communities was 0.25 脳 0.053 mm, accounting for 46.7% and 74.6% respectively, and there was a significant difference between the two groups (P0.05). The content of soil aggregates with particle size of 0.25 mm and 0.053mm was only 7.8% 鈮，

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