西南喀斯特石漠化环境适生植物构树细根、根际土壤化学计量特征

胡琪娟, 盛茂银, 殷婕, 白义鑫

Stoichiometric characteristics of fine roots and rhizosphere soil of Broussonetia papyrifera adapted to the karst rocky desertification environment in southwest China

HU Qi-Juan, SHENG Mao-Yin, YIN Jie, BAI Yi-Xin

表2 喀斯特石漠化强度分级标准

Table 2 Classification standard of karst rocky desertification

石漠化等级 Degree of rocky desertification 岩石裸露率 Percentage of bare rock (%) 土层覆盖度 Soil coverage (%) 植被和土层覆盖度之和 Coverage of vegetation and soil (%) 坡度 Slope (°) 平均土层厚度 Average of soil thickness (cm) 无 Nil <20 >60 >80 <15 >20 潜在 Potential 20-30 ≤60 70-80 ≥15 ≤20 轻度 Slight 31-50 ≤30 50-69 ≥18 ≤15 中度 Moderate 51-70 ≤20 30-49 ≥22 ≤10 强度 Severe 71-90 ≤10 10-29 ≥25 ≤5