四川农业大学学报
四川農業大學學報
사천농업대학학보
JOURNAL OF SICHUAN AGRICULTURAL UNIVERSITY
2014年
4期
362-368
,共7页
任姝婷%宫渊波%郑江坤%付万权%徐雄才
任姝婷%宮淵波%鄭江坤%付萬權%徐雄纔
임주정%궁연파%정강곤%부만권%서웅재
SOC 含量%植被类型%坡向%官司河流域
SOC 含量%植被類型%坡嚮%官司河流域
SOC 함량%식피류형%파향%관사하류역
soil organic carbon storage%vegetation types%slope positions%Guansi basin
【目的】研究官司河流域内不同植被覆盖和不同坡位下0~40 cm 深度土壤有机碳(SOC)密度和碳储量。【方法】选取流域内5种典型植被类型上、中、下坡位的土壤,分别测定0~20 cm、20~40 cm 深度 SOC 含量,并根据森林资源二类调查资料量化其区域的 SOC 储量。【结果】植被类型、坡位和土层对小流域不同 SOC 含量有显著影响。SOC 含量随土层深度的增加而递减;针叶纯林、经济林的 SOC 含量与坡位呈显著负相关(相关系数 r 分别为-0.731和-0.859),而林种结构复杂的针阔混交林和针针混交林没有显著的相关关系。0~40 cm SOC 含量为:经济林(10.21 g/kg)>针叶纯林(9.21 g/kg)>针阔混交林(9.15 g/kg)>农耕地(8.97 g/kg)>针针混交林(7.21 g/kg),整个流域0~40 cm SOC 储量为8.88×104 t。【结论】纯林(包括经济林、针叶纯林)相较混交林 SOC 含量较高;合理择伐,提高人工林植物多样性和土壤有机质含量是增加土壤有机碳储量的有效措施;人为干扰是导致该流域天然次生林土壤 SOC 储量降低的主要原因。因此,加强人工林管理和天然次生林的保护,使其免受人为干扰是提高官司河流域土壤有机碳储量的有效措施。
【目的】研究官司河流域內不同植被覆蓋和不同坡位下0~40 cm 深度土壤有機碳(SOC)密度和碳儲量。【方法】選取流域內5種典型植被類型上、中、下坡位的土壤,分彆測定0~20 cm、20~40 cm 深度 SOC 含量,併根據森林資源二類調查資料量化其區域的 SOC 儲量。【結果】植被類型、坡位和土層對小流域不同 SOC 含量有顯著影響。SOC 含量隨土層深度的增加而遞減;針葉純林、經濟林的 SOC 含量與坡位呈顯著負相關(相關繫數 r 分彆為-0.731和-0.859),而林種結構複雜的針闊混交林和針針混交林沒有顯著的相關關繫。0~40 cm SOC 含量為:經濟林(10.21 g/kg)>針葉純林(9.21 g/kg)>針闊混交林(9.15 g/kg)>農耕地(8.97 g/kg)>針針混交林(7.21 g/kg),整箇流域0~40 cm SOC 儲量為8.88×104 t。【結論】純林(包括經濟林、針葉純林)相較混交林 SOC 含量較高;閤理擇伐,提高人工林植物多樣性和土壤有機質含量是增加土壤有機碳儲量的有效措施;人為榦擾是導緻該流域天然次生林土壤 SOC 儲量降低的主要原因。因此,加彊人工林管理和天然次生林的保護,使其免受人為榦擾是提高官司河流域土壤有機碳儲量的有效措施。
【목적】연구관사하류역내불동식피복개화불동파위하0~40 cm 심도토양유궤탄(SOC)밀도화탄저량。【방법】선취류역내5충전형식피류형상、중、하파위적토양,분별측정0~20 cm、20~40 cm 심도 SOC 함량,병근거삼림자원이류조사자료양화기구역적 SOC 저량。【결과】식피류형、파위화토층대소류역불동 SOC 함량유현저영향。SOC 함량수토층심도적증가이체감;침협순림、경제림적 SOC 함량여파위정현저부상관(상관계수 r 분별위-0.731화-0.859),이림충결구복잡적침활혼교림화침침혼교림몰유현저적상관관계。0~40 cm SOC 함량위:경제림(10.21 g/kg)>침협순림(9.21 g/kg)>침활혼교림(9.15 g/kg)>농경지(8.97 g/kg)>침침혼교림(7.21 g/kg),정개류역0~40 cm SOC 저량위8.88×104 t。【결론】순림(포괄경제림、침협순림)상교혼교림 SOC 함량교고;합리택벌,제고인공림식물다양성화토양유궤질함량시증가토양유궤탄저량적유효조시;인위간우시도치해류역천연차생림토양 SOC 저량강저적주요원인。인차,가강인공림관리화천연차생림적보호,사기면수인위간우시제고관사하류역토양유궤탄저량적유효조시。
Objective]The aim of the study was to determine soil organic carbon (SOC)and stor-age at the depth of 40 cm in different vegetation types and slope positions.[Method]Soils (0-20 cm and 20-40 cm)on different slope positions of five vegetation types in the basin were sampled to determined SOC content.Additionally,according to forest resources investigation data,SOC density and storage was calculated.[Results]SOC content showed significant differences among vegetation types,slope positions and soil layers.SOC content decreased with increase in soil depth.SOC content in coniferous forests and economic forests were significantly negatively corre-lated with slope positions (r=-0.731 and r=-0.859).However,no significant correlation was found in theropencedrymion and mixed coniferous forest.SOC content at the depth of 40 cm fol-lowed the order:economic plantation (10.21 g/kg)> coniferous forest (9.21 g/kg)> thero-pencedrymion (9.15 g/kg)> farmland (8.97 g/kg)> mixed coniferous forest (7.21g/kg).The soil organic carbon storage in the basin was 8.88×104 t.[Conclusion]SOC content in mixed for-ests were lower compared to pure forests (coniferous forests and economic forests).Rationally cutting,improving plant diversity and soil organic matter may be effective measures to increase SOC storage.Human disturbance is the main reason to reduce SOC storage of natural secondary forest in the basin.Therefore,in order to improve SOC storage in the Guansi basin,protecting natural secondary forest from human disturbance and strengthening plantation management would be efficient measures.