生态环境学报
生態環境學報
생태배경학보
ECOLOGY AND ENVIRONMENT
2014年
1期
50-57
,共8页
武小钢%郭晋平%田旭平%杨秀云
武小鋼%郭晉平%田旭平%楊秀雲
무소강%곽진평%전욱평%양수운
芦芽山%有机碳%全氮%C/N%海拔梯度
蘆芽山%有機碳%全氮%C/N%海拔梯度
호아산%유궤탄%전담%C/N%해발제도
Luya Mountain%soil organic carbon (SOC)%total nitrogen%C/N%elevation gradients
研究不同海拔梯度和坡向的土壤碳氮分布,能在较小的空间尺度上反映不同气候状况下土壤碳氮分布规律,揭示多个互相关联的环境因子对土壤碳氮分布规律的综合影响。对山西省北部芦芽山芦芽山沿海拔梯度土壤有机碳和全氮含量的变化规律进行了分析。自海拔1703.1 m至2756.3 m每上升约50 m设置一个样带(共计21块),每样带内布设30 m×30 m样地3个,每个样地内“S”形布点,分3层(0~10、10~25、25~40 cm)钻取土样。结果表明,在研究海拔范围内土壤垂直剖面自表层向下有机碳质量分数分别为(35.71±13.32)、(29.18±12.85)和(26.39±12.74) g· kg-1,全氮质量分数分别为(2.83±0.93)、(2.38±0.84)和(2.12±0.80) g· kg-1。土壤有机碳和全氮含量的分布特征均表现为随海拔升高而增加的趋势,与海拔呈极显著的线性正相关。土壤有机碳含量与海拔线性模型的回归系数在10~25 cm土层最大,而全氮与海拔线性模型的回归系数随土层深度增加而递减。土壤有机碳含量最高值出现在较高海拔处寒温性针叶林下,而土壤全氮含量最高值出现在最高海拔的亚高山草甸。碳氮含量的剖面分布呈现为表层(0~10 cm)最高,随深度下降而递减。研究区土壤C/N值介于5~19,最小值为海拔最高(2756.3 m)的亚高山草甸,而最大值为较高海拔分布的寒温性针叶林(2332.6 m),沿海拔梯度表现呈“Λ”型的变化趋势。
研究不同海拔梯度和坡嚮的土壤碳氮分佈,能在較小的空間呎度上反映不同氣候狀況下土壤碳氮分佈規律,揭示多箇互相關聯的環境因子對土壤碳氮分佈規律的綜閤影響。對山西省北部蘆芽山蘆芽山沿海拔梯度土壤有機碳和全氮含量的變化規律進行瞭分析。自海拔1703.1 m至2756.3 m每上升約50 m設置一箇樣帶(共計21塊),每樣帶內佈設30 m×30 m樣地3箇,每箇樣地內“S”形佈點,分3層(0~10、10~25、25~40 cm)鑽取土樣。結果錶明,在研究海拔範圍內土壤垂直剖麵自錶層嚮下有機碳質量分數分彆為(35.71±13.32)、(29.18±12.85)和(26.39±12.74) g· kg-1,全氮質量分數分彆為(2.83±0.93)、(2.38±0.84)和(2.12±0.80) g· kg-1。土壤有機碳和全氮含量的分佈特徵均錶現為隨海拔升高而增加的趨勢,與海拔呈極顯著的線性正相關。土壤有機碳含量與海拔線性模型的迴歸繫數在10~25 cm土層最大,而全氮與海拔線性模型的迴歸繫數隨土層深度增加而遞減。土壤有機碳含量最高值齣現在較高海拔處寒溫性針葉林下,而土壤全氮含量最高值齣現在最高海拔的亞高山草甸。碳氮含量的剖麵分佈呈現為錶層(0~10 cm)最高,隨深度下降而遞減。研究區土壤C/N值介于5~19,最小值為海拔最高(2756.3 m)的亞高山草甸,而最大值為較高海拔分佈的寒溫性針葉林(2332.6 m),沿海拔梯度錶現呈“Λ”型的變化趨勢。
연구불동해발제도화파향적토양탄담분포,능재교소적공간척도상반영불동기후상황하토양탄담분포규률,게시다개호상관련적배경인자대토양탄담분포규률적종합영향。대산서성북부호아산호아산연해발제도토양유궤탄화전담함량적변화규률진행료분석。자해발1703.1 m지2756.3 m매상승약50 m설치일개양대(공계21괴),매양대내포설30 m×30 m양지3개,매개양지내“S”형포점,분3층(0~10、10~25、25~40 cm)찬취토양。결과표명,재연구해발범위내토양수직부면자표층향하유궤탄질량분수분별위(35.71±13.32)、(29.18±12.85)화(26.39±12.74) g· kg-1,전담질량분수분별위(2.83±0.93)、(2.38±0.84)화(2.12±0.80) g· kg-1。토양유궤탄화전담함량적분포특정균표현위수해발승고이증가적추세,여해발정겁현저적선성정상관。토양유궤탄함량여해발선성모형적회귀계수재10~25 cm토층최대,이전담여해발선성모형적회귀계수수토층심도증가이체감。토양유궤탄함량최고치출현재교고해발처한온성침협림하,이토양전담함량최고치출현재최고해발적아고산초전。탄담함량적부면분포정현위표층(0~10 cm)최고,수심도하강이체감。연구구토양C/N치개우5~19,최소치위해발최고(2756.3 m)적아고산초전,이최대치위교고해발분포적한온성침협림(2332.6 m),연해발제도표현정“Λ”형적변화추세。
Better understanding the distribution pattern of soil carbon storage (SOC) and total nitrogen (total N) along elevation gradients will facilitate the projection of global change on terrestrial C and N cycling. Soil organic carbon and total nitrogen contents in 0-0.1, 0.1-0.25 and 0.25-0.4 m soil layers were measured following the standard procedures for four vegetation communities:Subalpine meadow, cold temperate coniferous forest, coniferous and broad-leaved mixed forest and shrub grassland, along elevation gradients from 1 703.1 m to 2 756.3 m on the Luya Mountains in the eastern rim of the Loess Plateau in China. The results showed that the SOC and total N in the three layers were all positive linear correlated with elevation (P<0.001). The SOC of different layers are (35.71±13.32), (29.18±12.85) and (26.39±12.74) g· kg-1 respectively, and the total N contents are (2.83±0.93), (2.38±0.84) and (2.12±0.80) g· kg-1 respectively. Both are decreased with soil depth declined. The CN ratio varied from5 to 19 in study area. The highest value was observed in cold-temperate coniferous forest (2 332.6 m), but the lowest value in subalpine meadow (2 756.3 m). The CN ratio variation trend showed “Λ” with elevation gradients and which fitted with the Gaussian model. Elevation induced microclimatic differences and vegetation community types were found to be important factors for the significant variations in SOC and total N in the Luya Mountains.