遼寧省老禿頂子不同林分類型土壤有機(jī)碳儲(chǔ)量和碳氮垂直分布特征1)

趙俊勇 孫向陽(yáng) 李素艷 劉艷 張駿達(dá) 范俊崗

(北京林業(yè)大學(xué)，北京,100083) (遼寧省林業(yè)科學(xué)研究院)

?

遼寧省老禿頂子不同林分類型土壤有機(jī)碳儲(chǔ)量和碳氮垂直分布特征1)

趙俊勇 孫向陽(yáng) 李素艷 劉艷 張駿達(dá) 范俊崗

(北京林業(yè)大學(xué)，北京,100083) (遼寧省林業(yè)科學(xué)研究院)

以老禿頂子毛榛子灌叢、岳樺林、云冷杉與楓樺混交林、落葉闊葉林4種典型林分為對(duì)象，研究不同林分土壤有機(jī)碳質(zhì)量分?jǐn)?shù)和全氮質(zhì)量分?jǐn)?shù)的垂直分布特征及其與其它土壤基本屬性(土壤m(xù)(碳)∶m(氮)、全磷質(zhì)量分?jǐn)?shù)、全鉀質(zhì)量分?jǐn)?shù)、密度和pH值)的相關(guān)關(guān)系。結(jié)果表明：不同林分的土壤有機(jī)碳、全氮質(zhì)量分?jǐn)?shù)都隨著剖面深度的增加有明顯的降低，且不同土壤層次間呈現(xiàn)顯著性差異。不同林分土壤有機(jī)碳和全氮質(zhì)量分?jǐn)?shù)平均值分別在23.45～46.98、1.42～2.91 g/kg，其中云冷杉、楓樺混交林的土壤有機(jī)碳和全氮質(zhì)量分?jǐn)?shù)最高，分別為46.98、2.91 g/kg。各林分土壤m(xù)(碳)∶m(氮)平均值從大到小依次為岳樺林帶、云冷杉與楓樺混交林、落葉闊葉林、毛榛子灌叢帶；各林分0≤h<50 cm土層土壤有機(jī)碳儲(chǔ)量從大到小依次為云冷杉與楓樺混交林、毛榛子灌叢帶、岳樺林帶、落葉闊葉林帶，分別為96.36、89.73、81.93和66.16 t/hm2。與土壤有機(jī)碳質(zhì)量分?jǐn)?shù)呈顯著負(fù)相關(guān)的為土壤密度，呈極顯著負(fù)相關(guān)的為土壤pH值，沒(méi)有顯著相關(guān)性的為土壤m(xù)(碳)∶m(氮)、全磷質(zhì)量分?jǐn)?shù)、全鉀質(zhì)量分?jǐn)?shù)。

土壤有機(jī)碳；土壤有機(jī)碳儲(chǔ)量；垂直分布；林分類型；老禿頂子

We estimated soil organic carbon (SOC) storage and its vertical distribution under difference forest types, includingCorylusmandshuricaMaxim brushwood,Betulaermaniiforest,Picea-AbiesandRibbedBirchmixed forest, deciduous broad-leaved forest in Laotudingzi Mountain of Liaoning Provence. The content of SOC and total nitrogen (TN) decreased with increasing soil depth on all of the four soil profiles, and the content of SOC and TN showed significantly differences among layers. The content of SOC and TN inPicea-AbiesandRibbedBirchmixed forest were the highest among the four forest types (46.98 and 2.91 g/kg, respectively). The content of SOC and TN in four forest soils ranged from 23.45 to 46.98 g/kg and from 1.42 to 2.91 g/kg, respectively, in the descending order ofPicea-AbiesandRibbedBirchmixed forest,CorylusmandshuricaMaxim brushwood,Betulaermaniiforest, and deciduous broad-leaved forest. The mean C/N was in the descending order ofBetulaermaniiforest (18.1),Picea-AbiesandRibbedBirchmixed forest (16.2), deciduous broad-leaved forest (16.2), andCorylusmandshuricaMaxim brushwood (16.1). The descending order of SOC storage of 0-50 cm soil layer wasPicea-AbiesandRibbedBirchmixed forest (96.36 t/hm2),CorylusmandshuricaMaxim brushwood (89.73 t/hm2),Betulaermaniiforest (81.93 t/hm2), and deciduous broad-leaved forest (66.16 t/hm2). Correlations analysis showed significantly positive correlations between SOC and TN, and highly negative correlation between pH, but no significant correlations between C/N, total phosphorus and total potassium.

土壤是陸地生態(tài)系統(tǒng)中最大的碳庫(kù)[1]，占陸地總碳庫(kù)的2/3～3/4，在0～100 cm土層內(nèi)，全球約有1 500 Pg有機(jī)碳儲(chǔ)量[2]，是陸地植被碳儲(chǔ)量的3倍，大氣碳儲(chǔ)量的2倍[3]。全球土壤有機(jī)碳總量中2/3以上的有機(jī)碳來(lái)自森林土壤，森林土壤的碳匯功能在控制大氣CO2等溫室氣體濃度上升和有效調(diào)節(jié)碳平衡方面具有重要的作用[4]。因此，森林土壤有機(jī)碳儲(chǔ)量及其分布的研究已成為有機(jī)碳循環(huán)研究不可缺少的部分。……