ABSTRACT

A one-time, large application of biochar (charcoal) could increase soil carbon (C) content and improve overall soil quality. It is known that nematodes have effects on soil organic matter and nutrient cycling and are plant diseases; moreover, nematodes affect nutrient mobilization in C-rich soil conditions; however, information is scant on the effect of biochar addition on nematode communities. Therefore, the objective of this field study was to evaluate the influence of sugar maple hardwood biochar on soil nematode communities and assess the relation among soil nematode communities and soil nutrient concentrations. Nematode communities were sampled and identified in soils without biochar application and soil amended with an application of 8% by weight (equivalent to 160 Mg ha⁻¹). The application of 8% biochar did not change the abundance of nematodes but affected some nematode communities. Compared to the unamended soil, biochar-amended soil had lower plant-parasitic nematode populations and higher abundance of predatory nematodes. The Shannon diversity index (H’) was lower, and the maturity index (MI) was higher with a mean value of 2.38 with biochar addition compared to 2.21 in unamended plots. Higher soil acidity and addition of substantial amounts of magnesium, calcium, potassium, and manganese in the biochar-amended soils were recorded after biochar application.

摘要

一次性大量使用生物炭（木炭）可以增加土壤碳（C）含量并改善土壤整体质量。众所周知，线虫对土壤有机质和养分循环有影响，是植物病害。此外，线虫会影响富含C的土壤条件下的养分动员；但是，关于添加生物炭对线虫群落的影响的信息很少。因此，本田间研究的目的是评估糖枫硬木生物炭对土壤线虫群落的影响，并评估土壤线虫群落与土壤养分浓度之间的关系。在没有施用生物炭的土壤中对线虫群落进行采样和鉴定，并以8％的重量（相当于160 Mg ha ^-1）施用对土壤中的线虫进行了改良。）。8％生物炭的施用不会改变线虫的丰度，但会影响某些线虫群落。与未改良土壤相比，生物炭改良土壤具有较低的植物寄生线虫种群和较高的掠食性线虫种群。香农多样性指数（H'）较低，成熟度指数（MI）较高，添加生物炭时的平均值为2.38，而未修正地块的平均值为2.21。施用生物炭后，记录到生物炭改良过的土壤中较高的土壤酸度和大量的镁，钙，钾和锰的添加。