不同比例馬尾松木荷混交林枯落物與土壤水源涵養(yǎng)能力研究
發(fā)布時間:2018-12-14 17:52
【摘要】:林地枯落物層和土壤層作為發(fā)揮森林水源涵養(yǎng)功能的重要作用層,在林分水源涵養(yǎng)和保持水土方面起著非常重要的作用。論文以江西省興國縣的飛播馬尾松純林及其與木荷不同比例混交林的中齡林為研究對象,按樹種混交比例將林分劃分為類型Ⅰ(10馬)、類型Ⅱ(8馬2木)、類型Ⅲ(7馬3木)、類型Ⅳ(6馬4木)4種類型并設(shè)置標準地,在野外調(diào)查的基礎(chǔ)上結(jié)合室內(nèi)分析法,探討其林下枯落物現(xiàn)存量及持水特性、土壤物理性質(zhì)及蓄水能力,以期為改善和提高飛播馬尾松林的生態(tài)功能,尤其是水源涵養(yǎng)功能提供參考依據(jù)。主要研究結(jié)果如下:(1)4種類型枯落物總現(xiàn)存量的變動范圍為1.16~4.58 t/hm2,平均最大持水率為169.01~230.44%,總最大持水量為1.97~10.56 t/hm2,平均有效攔蓄率和總攔蓄量分別為124.37~161.30%和1.45~7.40 t/hm2,均表現(xiàn)為類型Ⅳ類型Ⅲ類型Ⅱ類型Ⅰ,且以上指標除類型Ⅳ的平均有效攔蓄率與類型Ⅲ差異不顯著(P0.05)外,其它各類型間均差異顯著(P0.05)。各類型未分解層和半分解層枯落物持水率與浸水時間均呈顯著對數(shù)關(guān)系,而其吸水速率與浸水時間均呈顯著冪函數(shù)關(guān)系。(2)4種類型0~80 cm土壤容重均值為1.29~1.44 g/cm3,表現(xiàn)為類型Ⅰ類型Ⅱ類型Ⅲ類型Ⅳ;土壤總孔隙度、毛管孔隙度、非毛管孔隙度均值分別為36.00~46.24%、30.95~36.80%、5.05~9.43%,其大小順序與土壤容重均值相反。0~80 cm土壤最大持水量為2799.17~3530.96 t/hm2、毛管持水量為2424.18~2815.71 t/hm2、非毛管持水量為374.99~715.24 t/hm2,均表現(xiàn)為類型Ⅳ類型Ⅲ類型Ⅱ類型Ⅰ。不同類型間的土壤容重、土壤總孔隙度、毛管孔隙度、土壤最大持水量、毛管持水量均差異不顯著(P0.05),而非毛管孔隙度、非毛管持水量除0~10 cm、10~20 cm土層及0~80 cm土層均表現(xiàn)為類型Ⅰ與類型Ⅱ差異不顯著(P0.05)外,其它各類型間均差異顯著(P0.05)。(3)4種類型林地(枯落物層和土壤層)最大持水量為2801.14~3541.52 t/hm2,有效持水量為76.44~722.64 t/hm2,均表現(xiàn)為類型Ⅳ類型Ⅲ類型Ⅱ類型Ⅰ。不同類型間林地最大持水量差異不顯著(P0.05),有效持水量為任意兩類型間差異顯著(P0.05)。土壤層最大蓄水量和有效蓄水量分別占林地最大蓄水量和有效蓄水量的99%和98%以上。林地最大持水量價值和有效持水量價值分別為22971.34~29042.92元/hm2和3087.09~5926.17元/hm2。
[Abstract]:As an important layer of forest water conservation, litter layer and soil layer play an important role in forest water conservation and soil conservation. In this paper, the mid-age forest of Pinus massoniana in Xingguo County, Jiangxi Province and its mixed forest with different proportion of Schima superba were studied. According to the proportion of tree species, the stands were divided into type 鈪,
本文編號:2379055
[Abstract]:As an important layer of forest water conservation, litter layer and soil layer play an important role in forest water conservation and soil conservation. In this paper, the mid-age forest of Pinus massoniana in Xingguo County, Jiangxi Province and its mixed forest with different proportion of Schima superba were studied. According to the proportion of tree species, the stands were divided into type 鈪,
本文編號:2379055
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