玉米马铃薯秸秆混合腐解的非加性效应

陈林康, 赵平, 王顶, 向蕊, 龙光强

Non-additive effect of mixed decomposition of maize and potato straw

CHEN Lin-Kang, ZHAO Ping, WANG Ding, XIANG Rui, LONG Guang-Qiang

图7 土壤性质、碳源和腐解秸秆碳氮比(C:N)对混合秸秆(A)、玉米秸秆(B)和马铃薯秸秆(C)分解率(SDR)影响的结构方程模型。实线表示负相关(蓝色)和正相关(红色), 虚线表示相关性不显著。AN, 铵态氮含量; DOC, 溶解性有机碳含量; NN, 硝态氮含量。MD, 微生物功能多样性, 用Shannon-Wiener指数和Simpson指数表示; CH, 碳水化合物, 用来I-赤藻糖醇(I-a)和D, L-a-甘油(DL)表示; CG, 碳源。GFI, 拟分优度指数; RMSEA, 均方根近似误差。*, p < 0.05; **, p < 0.01; ***, p < 0.001。PCA1, 马铃薯秸秆中D-木糖、N-乙酰基-D-葡萄胺、葡萄糖-1-磷酸盐、D-半乳糖醛酸和肝糖的第一主成分。

Fig. 7 Structural equation model of the effects of soil properties, carbon group and straw carbon nitrogen ratio (C:N) on decomposition rates (SDR) of mixed straw (A), maize straw (B) and potato straw (C). Solid lines represent negative (blue) and positive (red) correlations, respectively, dashed lines indicate that the correlation is not significant. AN, ammonium nitrogen content; DOC, dissolved organic carbon content; NN, nitrate nitrogen content. MD, microbial functional diversity, expressed by Shannon-Wiener index and Simpson index; CH, carbohydrate, expressed by I-alginol (I-a) and D, L-a-glycerin (DL); CG, carbon group. GFI, goodness-of-fit index; RMSEA, root mean square error of approximation. *, p < 0.05; **, p < 0.01; ***, p < 0.001. PCA1, the first principal components of D-xylose, N-acetyl-D-glucamine, glucose-1-phosphate, D-galacturonic acid and hepatic sugar in potato straw.