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对藏东南高山松天然林内的穿透雨、树干茎流以及林外大气降水进行了观测和取样,测定了水样中的N、P、K、Na、Ca、S、Mg、Si、Mn、Fe、Cu和Zn元素的含量,分析了其降水过程中养分元素浓度变化特征和输入规律。结果表明:大气降水、穿透雨和树干茎流中,养分元素浓度值的最大变异系数分别是1.485(Zn)、0.844(Na)和0.809(P),最小变异系数分别为0.255(S)、0.304(S)和0.318(Si)。3种形式水样中,微量元素之间以及微量元素与其他元素之间浓度值相关性不显著,其他元素俩俩之间浓度值相关性大部分达到显著水平。3种水样中,Cu元素年平均浓度值均最小,分别为0.023、0.047和0.066 mg/L,最大浓度分别为1.604 mg/L(N)、3.401 mg/L(Na)和4.371 mg/L(Na)。3种水样中各养分元素浓度值差异显著,并且均表现为:树干茎流>穿透雨>大气降水,各养分元素浓度月变化主要呈“∩”型、“N”型或“∪”型。所有元素的树干茎流和穿透雨淋溶系数均大于1,并且前者均大于相应的后者。研究期间,3种形式的养分输入量分别为64.172、79.949和15.623 kg/hm2。养分净淋溶量为34.057 kg/hm2(N除外),净淋溶量排序为:Na>Ca>K>Mg>Si>S>P>Mn>Fe>Zn>Cu,N元素净淋溶为-2.658 kg/hm2。
Penetrating rain, stem-stem flow and precipitation outside the forest were measured and sampled in natural forests of Pinus armandii in southeastern Tibet. The contents of N, P, K, Na, Ca, S, Mg, Si, Mn, Fe, Cu and Zn, and analyzed the characteristics and input rules of nutrient element concentration during precipitation. The results showed that the maximum coefficient of variation (CV) of nutrient element concentration in precipitation, penetration rain and stem stem flow were 1.485 (Zn), 0.844 (Na) and 0.809 (P), and the minimum coefficients of variation were 0.255 0.304 (S) and 0.318 (Si). There was no significant correlation between concentrations of trace elements and trace elements and other elements in the three forms of water samples, and most of the concentrations of other elements reached significant levels. Among the three water samples, the annual average concentration of Cu was the lowest (0.023,0.047 and 0.066 mg / L, respectively) and the highest concentrations were 1.604 mg / L and 4.401 mg / L, respectively (Na). The results showed that there were significant differences among the three kinds of water samples in nutrient concentration, and showed as follows: stem flow> penetration rain> atmospheric precipitation, and the monthly changes of nutrient element concentrations were mainly “∩”, “N” Or “∪ ” type. The stem flow rate and leaching rain leaching coefficient of all the elements were all greater than 1, and the former were larger than the latter. During the study period, the three nutrient inputs were 64.172, 79.949 and 15.623 kg / hm2, respectively. The net leaching amount of nutrients was 34.057 kg / hm2 (excluding N), and the order of net leaching was Na> Ca> K> Mg> Si> S> P> Mn> Fe> Zn> Cu. -2.658 kg / hm2.