湘北红壤丘岗稻田土壤有机碳、养分及微生物生物量空间变异  

Spatial variation in organic carbon,nutrients and microbial biomass contents of paddy soils in hilly red soil region

作　　者：唐国勇[1] 苏以荣[1] 肖和艾[1] 黄道友[1] 刘守龙[1] 黄敏[1] 吴金水[1] 

机构地区：[1]中国科学院亚热带农业生态研究所亚热带农业生态重点实验室

出　　处：《植物营养与肥料学报》2007年第1期15-21,共7页Journal of Plant Nutrition and Fertilizers

基　　金：中科院知识创新工程项目(KZCX2-YW-408;KZCX3-SW-426);国家"973"项目(G1999011802;2002CB412503);国家自然科学基金重点项目(40235057)资助

摘　　要：通过对湘北典型红壤丘岗254个稻田耕层样（0～18cm）进行分析，比较了微地形对稻田土壤有机碳、氮、磷和微生物生物量的影响。结果表明，丘岗底部稻田土壤有机碳、全氮、微生物生物量碳、微生物生物量氮、可溶性氮含量分别比丘岗中下部稻田高14．6％、13．6％、24．6％、20．4％和95．8％，丘岗中下部稻田土壤Olsen—P含量比丘岗底部稻田高33．3％，差异均达极显著水平（P〈0.01）。不同部位稻田土壤全磷、微生物生物量磷含量和有效磷库（微生物生物量磷与Olsen—P之和）含量差异不显著。此外，丘岗底部稻田土壤碳磷比、微生物生物量碳磷比和微生物商比丘岗中下部稻田高12．7％，28．5％，8．2％，其差异达显著（P〈0．05）或极显著（P〈0.01）水平。但微生物生物量氮／全氮、微生物生物量磷／全磷、土壤碳氮比和微生物生物量碳氮比差异不显著。The contents of soil organic C （SOC）, total N （TN）, total P （TP）, dissoluble N （DN）, Olsen-P, and microbial biomass C, N, P （Bc, BN, Bp） of 254 paddy soils （0-18 cm） in hilly red soil region of subtropical zone of China were studied. The results showed that the contents of SOC, TN, BC, BN and DON of paddy soils at bottom of hills were 14.6%, 13.6%, 24.6%, 20.4% and 95.8% higher than that of paddy soils at foothill, respectively. The Olsen -P contents of paddy soils at foothill were 33.3% higher than that at bottom of hills. However, the differences in TP, BP and available P （the sum of BP and Olsen-P） contents were not significant between various positions. In addition, the ratios of soil C/N, Bc/BP and Bc/SOC of paddy soils at bottom of hills were 12.7%, 28.5% and 8.2% higher than that at foothill, respectively, but the differences in ratios of soil C/N, BC/BN, BN/TN and BP/TP were not significant statistically between various positions.

关 键 词：红壤丘岗 水稻土 土壤养分 微生物生物量 地形部位 

分 类 号：S158[农业科学—土壤学]