第 38 卷第 3 期 湖南农业大学学报(自然科学版) Vol.38 No.3
2012 年 6 月 Journal of Hunan Agricultural University (Natural Sciences) Jun.2012
DOI:10.3724/SP.J.1238.2012.00314
外源碳酸钙和稻草对喀斯特地区土壤活性有机碳的影响
葛云辉
1, 2, 3
,邹冬生
1*
,苏以荣
2, 3
,何寻阳
2, 3
(1.湖南农业大学 生物科学技术学院,湖南 长沙 410128;2.中国科学院亚热带农业生态研究所亚热带农业生态过
程重点实验室,湖南 长沙 410125;3.中国科学院环江喀斯特生态系统观测研究站,广西 环江 547100)
摘 要:为了解喀斯特土壤活性有机碳在土壤有机碳周转中的特征,设置在干土中添加
14
C–稻草(每 1 g 干土添
加 500 µg C)、
14
C–CaCO
3
粉末(每 1 kg 干土添加 50 g C)和不添加任何外源物(CK)3 种处理,对广西环江县 2 种典
型类型土壤棕色石灰土、黑色石灰土和地带性红壤进行为期 100 d 的室内培养试验。结果表明,添加
14
C–稻草和
14
C–CaCO
3
后 5 d,红壤、棕色和黑色石灰土中土壤总微生物生物量碳(MBC)含量均达峰值,红壤中总 MBC 含量
分别为 231.7、273.0 mg/kg,分别高于对照 70.2%和 100.5%;棕色石灰土中总 MBC 含量分别为 288.1、307.7 mg/kg,
分别高于对照 23.0%和 31.3%;黑色石灰土中总 MBC 含量分别为 683.7、787.2 mg/kg,分别高于对照 4.5%和 20.3%。
3 种土壤总溶解有机碳(DOC)含量均达到最大值;黑色石灰土总 MBC 含量显著大于棕色石灰土和红壤,而红壤总
DOC 含量显著大于石灰土(P<0.05)。
14
C–稻草对 3 种土壤
14
C–MBC、
14
C–DOC 含量的影响显著大于
14
C–CaCO
3
的影响(P<0.05)。添加外源碳酸钙和稻草均能增加土壤活性有机碳含量。喀斯特地区石灰性土壤较红壤稳定,有
利于土壤有机碳的积累。
关 键 词:碳酸钙;稻草;土壤微生物生物量碳;溶解有机碳;
14
C 示踪技术;喀斯特
中图分类号:S153.6 文献标志码:A 文章编号:1007–1032(2012)03–0314–05
Influence of exogenous calcium carbonate and rice straw
on active organic carbon of Karst soils
GE Yun-hui
1,2,3
, ZOU Dong-sheng
1*
, SU Yi-rong
2,3
, HE Xun-yang
2,3
(1.College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China; 2.Key
Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, the Chinese
Academy of Sciences, Changsha 410125, China; 3.Huanjiang Observation and Research Station for Karst Ecosystems,
Chinese Academy of Sciences, Huanjiang, Guangxi 547100, China)
Abstract: To elucidate the features of active organic carbon in Karst soils in the turnover of soil organic carbon,
14
C–labeled straw and
14
C–labeled calcium carbonate were respectively added to each of the terra fusca, rendzina and
zonal red soil of Huanjiang Guangxi for a 100 d incubation test. Soils with no addition were regarded as CK. Results
showed that
14
C–labeled straw exhibited obviously higher influence on
14
C–MBC,
14
C–DOC in the three soils, compared
to
14
C–labeled calcium carbonate (P<0.05). After 5 d of incubation, total MBC (microbial biomass carbon) reached the
peak in the three soils added with
14
C–labeled straw or
14
C–labeled calcium carbonate, and the MBC in red soils was
231.7,273.0 mg/kg , were respectively 70.2% and 100.5% higher than that in the CK ; the MBC in terra fusca was 288.1,
307.7 mg/kg , were respectively 23.0% and 31.3% higher than that in the CK while MBC in rendzina was 683.7,787.2
mg/kg , were respectively 4.5% and 20.3% higher than that in the CK; DOC (dissolved organic carbon) in the three soils
also reached the maximum. The MBC in rendzina was obviously higher than that in terra fusca and red soil, but the DOC
in red soil was obviously higher in terra fusca, rendzina (P<0.05). Exogenous
14
C–labeled matters could promote the
收稿日期:2012–03–02
基金项目:中国科学院战略性先导科技专项(XDA05070403);中国科学院西部行动计划项目(KZCX2–XB3–10);国家自然科学基金项目
(30970538,41171246);中国科学院亚热带农业生态研究所青年人才领域前沿项目(ISACX–LYQY–QN–1101)
作者简介:葛云辉(1987—),女,云南易门人,硕士研究生,主要从事农业生态学研究,geyunhui713@126.com;*通信作者,zoudongsheng2@
sina.com