长期集约经营对雷竹林土壤碳氮磷库特征的影响  

EFFECT OF LONG-TERM INTENSIVE MANAGEMENT OF PHYLLOSTACHYS PRAECOX STANDS ON CARBON,NITROGEN,AND PHOSPHORUS POOLS IN THE SOIL

作　　者：张涛[1,2] 李永夫[1,2] 姜培坤[1,2] 周国模[1,2] 秦华[1,2] 林琳[1,2] 

机构地区：[1]浙江农林大学浙江省森林生态系统碳循环与固碳减排重点实验室,311300 [2]浙江农林大学-中国科学院南京土壤研究所森林土壤与环境联合实验室,311300

出　　处：《土壤学报》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

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.

关 键 词：雷竹林 集约经营 碳库 氮库 磷库 核磁共振 

分 类 号：S714[农业科学—林学]