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为全面了解杨树-农作物间作系统的固碳效能,研究了沙质平原区3、9、13、17a杨农(杨树与农作物)间作系统土壤有机碳库特征。结果表明,杨农间作系统土壤有机碳含量随着土层深度增加而逐步下降,随着间作年限增加而增加;0～60cm土壤有机碳密度随着间作年限的增加而增加,间作3、9、13、17a分别达到11.25、11.19、13.71、16.17t/hm2;土壤碳密度随着土层深度增加而下降,但随着间作年限增加,40～60cm土壤碳密度所占比例逐步增加,到间作17a时,已达到28.76%,说明随着间作年限增加可以增加深层土壤固碳能力;土壤有机碳固存速率随着间作年限增加而增加,间作3～9a为0.145 0t/(hm2·a),间作9～13a为0.397 5t/(hm2·a),间作13～17a达到最高,为0.615 0t/(hm2·a),平均为0.351 4t/(hm2·a),说明豫东平原杨农间作系统要达到一定年限,才能充分发挥其土壤固碳效能。
In order to fully understand the carbon sequestration efficiency of the poplar-crop intercropping system, the characteristics of soil organic carbon pool in the intercropping system of 3, 9, 13, 17a young poplars (poplars and crops) in sandy plains were studied. The results showed that the soil organic carbon content in the intercropping system decreased gradually with the increase of soil depth and increased with the increase of intercropping years. The density of organic carbon in 0-60 cm soil layer increased with the increase of intercropping interval, 13 and 17a reached 11.25, 11.19, 13.71 and 16.17 t / hm2, respectively. The soil carbon density decreased with the increase of soil depth. However, with the increase of intercropping years, the proportion of soil carbon density in 40-60 cm soil increased gradually, , Which has reached 28.76%, indicating that with the increase of intercropping years can increase the deep soil carbon sequestration; soil organic carbon storage rate increases with intercropping years increased intercropping 3 ~ 9a 0.145 0t / (hm2 · a), intercropping 9 ~ 13a was 0.397 5t / (hm2 · a), intercropping 13 ~ 17a reached the highest, 0.615 0t / (hm2 · a), with an average of 0.351 4t / (hm2 · a), indicating that the Yudong-Dongyang intercropping system To reach a certain age, in order to give full play to its soil carbon sequestration.