Predicting Agricultural Management Influence on Long-Term Soil Organic Carbon Dynamics: Implications for Biofuel Production

摘要: Long-term fi eld experiments (LTE) are ideal for predicting the infl uence of agricultural management on soil organic carbon (SOC) dynamics and examining biofuel crop residue removal policy questions. Our objectives were (i) to simulate SOC in LTE soils under various climates, rotations, fertilizer or amendments, managements using CQESTR model (ii) predict potential no-tillage (NT) maintain stocks while removing residue. Classical LTEs at Champaign, IL (1876), Columbia, MO (1888), Lethbridge, AB (1911), Breton, (1930), Pendleton, OR (1931) selected their documented history practice periodic matter (SOM) measurements. Management practices ranged from monoculture 2- 3-yr manure, no additions, returned, burned, harvested. Measured predicted diverse agronomic practices, mean annual temperature (2.1–19oC), precipitation (402–973 mm), (5.89−33.58 g kg −1 ) sites signifi cantly related (r 2 = 0.94, n 186, P < 0.0001) with a slope not diff erent than 1. Th e simulation results indicated that quantities can be sustainably harvested without jeopardizing uenced by initial stocks, rotation intensity, tillage yield, climate. Manure cover crop/intensifi ed NT options mitigate loss C, as alone is insuffi cient overcome impact stocks.