关键词: 温度耐性, 养分, 非结构性碳水化合物, 地理种源, 栓皮栎

Abstract: To clarify the effects of biochar application and regulated deficit irrigation on soybean, a pot experiment was conducted with randomized block design and using soybean Kaiyu 12 as experimental material. We examined the effects of different biochar application rates \[B₀ (0 t·hm^-2), B₁ (6 t·hm^-2), B₂ (12 t·hm^-2)\] and different degrees of regulated deficit irrigation \[W₁ (full irrigation, 70% field capacity), W₂ (mild regulated deficit irrigation, 55%-60% field capacity), W₃ (severe regulated deficit irrigation, 45%-50% field capacity)\] on the growth, yield, and water use of soybean. The results showed that leaf area index and underground dry matter accumulation of soybean were not affected by the mild regulated deficit irrigation, but increased with the increasing biochar application rates. The aboveground dry matter accumulation decreased with the aggravation of the regulated deficit degree, but increased when 12 t·hm^-2 biachar was applied. Both regulated deficit irrigation and biochar could affect water consumption of soybean. Water consumption decreased with the aggravation of the regulated deficit degree. Biochar application with a rate of 6 t·hm^-2 had the highest water consumption, but was conductive to the formation of yield. Compared with full irrigation without biochar (W₁B₀), mild regulated deficit irrigation with applying 6 t·hm^-2 biochar (W₂B₁) increased yield by 16% and water use efficiency by 21.4%. Therefore, mild regulated deficit irrigation with 6 t·hm^-2 biochar application (W₂B₁) could effectively improve yield and water use efficiency of soybean.

Key words: provenance, non-structural carbohydrate, thermal tolerance, nutrient, Quercus variabilis.