埋管通气对雷竹林土壤氧气体积分数的影响

Soil oxygen content of Phyllostachys violascens with pipe-buried aeration

[目的] 为改善土壤氧气体积分数提供方法手段,以实现退化雷竹Phyllostachys violascens林的可持续经营。 [方法] 通过田间试验,利用原位氧测定方法,分析了埋管通气法对不同通气处理(覆盖不通气M,覆盖通气MA,不覆盖通气A及不覆盖不通气对照ck)下雷竹林土壤氧气体积分数的影响。 [结果] 覆盖会造成雷竹林根系的低氧胁迫,土壤埋管通气能有效提高雷竹林土壤氧气体积分数。在土壤40 cm深的水平方向上,相比未通气地块,土壤氧气体积分数提高了2.20%~5.25%;在土壤垂直方向上,可提高各土层土壤氧气体积分数0.78%~4.98%。在覆盖处理时,埋管通气可提高土壤氧气体积分数1.26%~4.71%。在土壤含水饱和时,通气处理可提高土壤氧气体积分数0.69%~7.58%。 [结论] 土壤埋管通气法能有效提高雷竹林土壤氧气体积分数,在雷竹林高效经营方面有较好的应用前景。

Objective Limitations to growth and biomass production are expected due to low soil oxygen content. To increase soil oxygen content of Phyllostachys violascens stands under various managements and to provide a new technique for soil aeration and sustainable management of P. violascens are necessary. Method A pipe-buried aeration method was adopted. An in-situ measurement was used to detect soil oxygen content of various managed bamboo stands. There are split-plot design with four treatments (M:mulching without aeration, MA:mulching with aeration, A:no mulching with aeration, and ck:no mulching without aeration) and 3 replications. We studied the response of soil oxygen content after pipe-buried aeration to four levels of soil depth(V10, V20, V30 and V40, respectively)and four levels of distance to pipe(H15, H30, H45 and H60, respectively). Result The mulching technique could lead to soil hypoxia, but the pipe-buried aeration improved soil oxygen significantly(P < 0.05). In the soil layer below 40 cm, soil oxygen content increased 2.20%-5.25% compared to the control(P < 0.05). For the vertical level in various layers, soil oxygen content increased 0.78%-4.98%(P < 0.05). When the mulching technique was adopted, the pipe-buried aeration method increased soil oxygen content 1.26%-4.71%(P < 0.05). When water saturated, the aeration method increased soil oxygen content 0.69%-7.58%(P < 0.05). Conclusion The pipe-buried aeration method was an effective measure for increasing bamboo soil oxygen content, and it could be promising with sustainable bamboo management.