生物炭添加对潮棕壤土壤性状及玉米生长的影响

Effects of Biochar Amendment on Soil Properties and Corn Growth in Aquic Brown Soil

采用田间微区试验方法,研究不同生物炭添加量[0(CK)、22.5 t/hm2(C1)、67.5 t/hm2(C2)和112.5 t/hm2(C3)]对玉米不同生长期土壤有机碳(SOC)、微生物生物量碳(MBC)、玉米生长和产量的影响。结果表明,生物炭添加提高了土壤MBC和SOC含量,处理组C1、C2和C3的SOC含量较对照组CK增加20.9%、57.25%和93.23%,并且MBC占SOC比例的变化表明生物炭的添加促进了土壤MBC对土壤有机质(SOM)的贡献。另外,在生物炭添加处理下,土壤含水量和土壤MBC呈显著的正相关。生物炭的添加增加了开花期玉米的株高、茎粗、叶面积指数以及成熟期玉米的百粒重和产量。相比于对照组CK,处理组C2和C3株高增加15.99%、21.55%,茎粗增加13.77%、9.64%,产量增加23.23%、23.12%;处理组C1、C2和C3叶面积指数高于CK 13.89%、44.52%和47.26%。

A field microplot experiment was conducted to investigate the impacts of different biochar addition[0（CK）, 22.5 t/ha（C1）, 67.5 t/ha（C2） and 112.5 t/ha（C3）] on soil organic carbon（SOC）, microbial biomass carbon（MBC）,corn growth and yields during different growing periods. The results indicated that SOC, soil MBC and water contentwere enhanced significantly with biochar addition, SOC was increased by 20.9%, 57.25% and 93.23% at C1, C2 and C3 plot. The increase of MBC/SOC with biochar amendment promoted more contributions of microorganism toorganic matter. Biochar amendment significantly enhanced the plant height, stem diameter and leaf area index ofcorn in flowering period and corn 100-kernel weight and yields in maturing period. Furthermore, MBC had signifi-cantly positive correlation with the soil water content after biochar added to soil. C2 and C3 treatments significantlyincreased the plant height by 15.99% and 21.55%, the stem diameter by 13.77% and 9.64% and the yield by23.23% and 23.12%, C1, C2 and C3 treatment increased leaf area index by 13.89%, 44.52% and 47.26%.