摘要
为了研究长期集约经营对雷竹林土壤碳库与养分库的影响,在浙江省临安市三口镇选择了两块相邻的集约经营雷竹林样地(经营时间分别为1 a和15 a)采样,分析测定了土壤不同形态碳、氮和磷,并利用核磁共振方法分析了土壤总有机碳的波谱特征。结果表明:与集约经营1 a雷竹林相比较,15 a集约经营雷竹林土壤总有机碳、水溶性有机碳、热水溶性有机碳和易氧化碳含量分别增加了249%、197%、81.8%和116%,但微生物生物量碳含量下降了17.6%。土壤有机碳的固态核磁共振结果表明,雷竹林土壤有机碳以烷基碳和烷氧碳为主。与1 a集约经营相比较,15 a集约经营后,土壤烷基碳和烷基碳/烷氧碳比(A/O-A)显著增加(p<0.05)、芳香碳和芳香度显著下降(p<0.05),而烷氧碳和羧基碳没有显著变化。与集约经营1 a雷竹林相比较,15 a集约经营雷竹林土壤水溶性有机氮、NH4+-N、NO3--N、有效磷和有机磷含量显著增加(p<0.05),但微生物生物量氮和微生物生物量磷含量分别下降了36.5%和22.7%。综上所述,长期集约经营导致雷竹林土壤碳库和氮磷养分库的贮量显著增加,而土壤微生物活性和土壤有机碳库的稳定性却显著下降。
To study effect of long-term intensive management of Phyllostachys praecox stands on C and nutrients pools in the soil, soil samples were collected from two adjoint Phyllostachys praecox stands that had been subjected to intensive management for 1 and 15 years, separately, in Lin＇an County, Zhejiang Province. Different forms of C, N, and P pools were determined and spectral characteristics of soil total organic carbon were analyzed using the nuclear magnetic resonance （NMR） technique. Results show that in comparison to the Phyllostachys praecox stand, 1 year under intensive management, the stand 15 years under intensive management was 248.5% , 197% , 81.8% , and 116% higher in soil total organic carbon, water-soluble organic C, hot water-soluble organic C, and readily oxidizable C （ROC） , respectively, but 17.6% lower in MBC content. Solid-state NMR spectroscopy of soil samples showed that alkyl C and O-alkyl C dominated soil organic C in PhyUostachys praecox stands. Compared to the Phyllostachys praecox stand 1 year under intensive management, the stand 15 years under intensive management was significantly higher in soil alkyl C content and alkyl C to O-al- kyl C ratio （A/O-A） （p 〈 0.05 ）, but much lower in aromatic C content and organic matter aromaticity （p 〈 0.05 ）, and however remained unchanged in O-alkyl C and carbonyl C. Moreover, in comparison to the Phyllostachys praecox stand 1 year under intensive management, the stand 15 years under intensive management was much higher in soil water-soluble organic N, NH4 -N, NO3 -N, available P, and organic P （p 〈 0.05 ）, but 36.5% and 22.7% lower in microbial biomass N and microbial biomass P, respectively. In conclusion, long-term intensive management helps build up carbon pools and nutrients pools, but significantly affects activity of the soil microbial activity and stability of the organic carbon in the soil.
出处
《土壤学报》
CAS
CSCD
北大核心
2012年第6期1170-1177,共8页
Acta Pedologica Sinica
基金
国家自然科学基金项目(31170576)
浙江省科技厅重点项目(2011C12019)
浙江省自然科学基金项目(Y3080337)
浙江农林大学科研发展基金项目(2007FR040)共同资助
关键词
雷竹林
集约经营
碳库
氮库
磷库
核磁共振
Phyllostachys praecox
Intensive management
Carbon pool
Nitrogen pool
Phosphorus pool
NMR
