四川农业大学学报
四川農業大學學報
사천농업대학학보
JOURNAL OF SICHUAN AGRICULTURAL UNIVERSITY
2014年
3期
277-282
,共6页
干旱河谷%植被恢复%土壤有机碳%土壤全氮%碳氮比
榦旱河穀%植被恢複%土壤有機碳%土壤全氮%碳氮比
간한하곡%식피회복%토양유궤탄%토양전담%탄담비
dry valley%vegetation restoration%soil organic carbon%soil total nitrogen%C/N
【目的】研究白龙江干旱河谷灌丛自然恢复过程中土壤有机碳和全氮储量的动态特征。【方法】在甘肃舟曲白龙江干旱河谷自然恢复灌丛群落中布设样地,开展群落调查和土壤分层取样,采用环刀法测量土壤容重、采用重铬酸钾外加热法测定土壤有机碳含量,用半微量凯氏法测定土壤全氮含量。【结果】随着灌丛群落自然恢复时间的增长,土壤有机碳储量、全氮储量明显增加。土壤有机碳储量从恢复5 a时的58.18 Mg/hm2,经82.48 Mg/hm2(8 a)、127.24 Mg/hm2(15 a),逐步增加到原生阶段的213.41 Mg/hm2;全氮储量从4.42 Mg/hm2(5 a),经5.75 Mg/hm2(8 a)、6.59 Mg/hm2(15 a),增加到原生阶段的11.85 Mg/hm2;土壤碳氮比在5 a、8 a、15 a、原生阶段分别为13.15、14.35、19.31、18.00。【结论】随着干旱河谷灌丛群落的自然恢复,其土壤结构改善明显,有机碳储量和全氮储量增加明显,干旱河谷灌丛群落土壤储碳潜力较大。
【目的】研究白龍江榦旱河穀灌叢自然恢複過程中土壤有機碳和全氮儲量的動態特徵。【方法】在甘肅舟麯白龍江榦旱河穀自然恢複灌叢群落中佈設樣地,開展群落調查和土壤分層取樣,採用環刀法測量土壤容重、採用重鉻痠鉀外加熱法測定土壤有機碳含量,用半微量凱氏法測定土壤全氮含量。【結果】隨著灌叢群落自然恢複時間的增長,土壤有機碳儲量、全氮儲量明顯增加。土壤有機碳儲量從恢複5 a時的58.18 Mg/hm2,經82.48 Mg/hm2(8 a)、127.24 Mg/hm2(15 a),逐步增加到原生階段的213.41 Mg/hm2;全氮儲量從4.42 Mg/hm2(5 a),經5.75 Mg/hm2(8 a)、6.59 Mg/hm2(15 a),增加到原生階段的11.85 Mg/hm2;土壤碳氮比在5 a、8 a、15 a、原生階段分彆為13.15、14.35、19.31、18.00。【結論】隨著榦旱河穀灌叢群落的自然恢複,其土壤結構改善明顯,有機碳儲量和全氮儲量增加明顯,榦旱河穀灌叢群落土壤儲碳潛力較大。
【목적】연구백룡강간한하곡관총자연회복과정중토양유궤탄화전담저량적동태특정。【방법】재감숙주곡백룡강간한하곡자연회복관총군락중포설양지,개전군락조사화토양분층취양,채용배도법측량토양용중、채용중락산갑외가열법측정토양유궤탄함량,용반미량개씨법측정토양전담함량。【결과】수착관총군락자연회복시간적증장,토양유궤탄저량、전담저량명현증가。토양유궤탄저량종회복5 a시적58.18 Mg/hm2,경82.48 Mg/hm2(8 a)、127.24 Mg/hm2(15 a),축보증가도원생계단적213.41 Mg/hm2;전담저량종4.42 Mg/hm2(5 a),경5.75 Mg/hm2(8 a)、6.59 Mg/hm2(15 a),증가도원생계단적11.85 Mg/hm2;토양탄담비재5 a、8 a、15 a、원생계단분별위13.15、14.35、19.31、18.00。【결론】수착간한하곡관총군락적자연회복,기토양결구개선명현,유궤탄저량화전담저량증가명현,간한하곡관총군락토양저탄잠력교대。
Obj ective]The obj ective of this study was to clarify the dynamics of soil organic carbon and nitrogen of different shrub communities in the Bailongjiang dry valley,Gansu province.[Method]Soil samples were collected from shrubs in the in the Bailongjiang dry valley of Gansu province.Soil bulk density was measured by ring-knife.Soil organic carbon was determined by potassium dichromate oxidation titration.Soil total nitrogen was analyzed by Kjeldahl nitrogen determination.[Results]With the increase of natural recovery time,the storages of soil organic carbon and total nitrogen increased significantly.Soil organic carbon was 58. 18 Mg/hm2 ,82. 48 Mg/hm2 ,127. 24 Mg/hm2 and 213. 41 Mg/hm2 ,respectively,in 5 a,8 a,15 a and primary stage. Soil Nitrogen was 4. 42 Mg/hm2 ,5. 75 Mg/hm2 ,6. 59 Mg/hm2 ,11. 85 Mg/hm2 ,respectively,in 5 a,8 a,15 a and primary stage.Moreover,the ratio of organic carbon to nitrogen was 13. 15, 14. 35,19. 31 and 18. 00 respectively,in 5 a,8 a,15 a and primary stage.[Conclusion]Soil bulk density decreased with increasing vegetation restoration ages and soil organic carbon and nitrogen increased with vegetation restoration.