| 摘要: |
| 文章研究了粤北天井山林场2 hm2样地内土壤有机碳的分布特征及随土层、土壤理化性质的变化。结果表明：（1）0～25 cm土壤密度均值为（0.76±0.02） g/cm3，土壤有机碳平均质量分数为(32.29±1.66) g/kg；25～50 cm土壤密度均值为（0.96±0.02） g/cm3 ，土壤有机碳平均质量分数为(19.37±1.16) g/kg，土壤密度和有机碳质量分数均为中等变异，且服从正态分布；（2）0～25 cm土壤有机碳密度（5.98±0.28 kg/m2）极显著高于25～50 cm土层（4.57±0.29 kg/m2）,且均服从正态分布，变异系数为中等；（3）0～25 cm土壤有机碳密度与全氮、全磷、碱解氮、速效钾极显著正相关，与全氮和碱解氮的相关系数最大；25～50 cm土壤有机碳密度与全氮、全磷、碱解氮极显著正相关，与速效磷显著正相关，与全氮和碱解氮的相关系数分别达到0.81和0.80。 |
| 关键词: 粤北 次生常绿阔叶林 土壤密度 有机碳 分布特征 |
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| Distribution Patterns of SOC in Secondary Evergreen Broad leaf \=Forest in North Guangdong |
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Li Yan-Ming,Zhou Yi,Chen HUI- Zhi
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| Abstract: |
| 2 hm2 evergreen broad leaf forest were set in Tianjingshan State Forest Farm of north Guangdong, in August 2009, to study distribution of soil organic carbon (SOC) and its variation with soil depth. The result indicated that: (1)The density and SOC of 0～25 cm depth were （0.76±0.02） g/cm3 and (32.29±1.66) g/kg, respectively, and those of 25～50 cm depth were （0.96±0.02） g/cm3 and (19.37±1.16) g/kg. The density and SOC of 0～25 cm and 25～50 cm depth followed a normal distribution and middle heterogeneity degree, with an coefficient of variation; (2) Soil organic carbon density (SOCD) of 0～25 cm (5.98±0.28 kg/m2 ) depth was higher than that of 25～50 cm depth (4.57±0.29 kg/m2), likewise SOCD were close to a normal distribution and middle heterogeneity degree; (3) Correlations analysis showed that SOCD of 0～25 cm depth were highly positively correlated with TN, TP, AN, AK, and the r with TN, AN were maximum; while SOCD of 25～50 cm depth were highly positively correlated with TN, TP, AN, and positively correlated with AP. Specifically, the r of SOCD with TN, AN were up to 0.81 and 0.80. |
| Key words: the north of Guangdong secondary evergreen broad-leaf forest socd soc distribution |
