摘要
DNDC (denitrification-decomposition,反硝化-分解)模型是一个含有时间因子的模拟生物地球化学过程较为成熟的动态模拟模型,可用于模拟和评估作物(如水稻)生产、碳氮动态演变以及温室气体排放等。为了能够更充分地认识DNDC模型,使之得到更广泛应用,本文基于DNDC模型的构成与功能、目前6个(DNDC、CENTURY、CASA、EPIC、Biome-BGC、Roth C)世界著名的生物地球化学模型的比较及其DNDC模型在稻田生态系统中的模块优化,从稻田土壤碳动态角度出发,分析和总结了DNDC模型在稻田土壤固碳潜力、温室气体CO2和CH4排放模拟、稻田管理模式评估以及模型参数敏感性分析方面的研究进展。本文也指出,受土壤属性空间异质性大、区域田间管理措施差异等因素影响,DNDC模型存在诸如点位尺度验证难以扩展到区位尺度模拟、模型矫正困难等限制模型准确性的问题。为使DNDC模型能够在中国复杂的农耕特征下开展模拟研究,今后的发展应重视DNDC模型模块功能优化、提高输入参数精确度等,进一步提高模型模拟精确度和预测评价系统的可信度,使模型更好地预测土壤碳动态变化,在稻田生态系统固碳减排和管理方案制定等方面发挥作用。
稻田生态系统是在人为耕作条件下形成并长期处于淹水状态的特殊土壤生态系统,具有较高的固碳能力,也是CO2、CH4和N2O温室气体重要的源和
稻田生态系统碳动态变化研究通常采用直接观测法,该方法耗时耗力,观测区域及时间极为有限,大范围的区域排放情况代表性较差,而利用模型将有限的点位观测案例扩展到较大的区域尺度,能够弥补田间直接观测的不
DNDC是以模拟农业生态系统中碳氮循环为目的,耦合生态环境驱动因子及其相应的生物地球化学过程的模型。模型最初由新罕布什尔大学的李长生教授及其团队研发,主要用计算机模拟表达硝化作用和分解作用,用于描述美国土壤碳氮循环和反应机

图 1 DNDC 模型结
Fig.1 The structure of DNDC mode
DNDC、CENTURY、CASA、EPIC、Biome-BGC、Roth C是目前应用较为广泛的6个生物地球化学模型。这6个模型起源存在差异,不同模型优势以及发展过程中经验积累不同,针对同一模拟评估对象所能达到的模拟精度也有层次之分(
模型名Model name | 优点 Advantages | 缺点 Disadvantages |
---|---|---|
DNDC |
模拟时间尺度长;对农业领域碳氮循环过程模拟经验丰富且效果较好;模块考虑参数详细能够较好描述、预测农业生态系统碳氮循环的源、库、流及反馈机制;适用性,强能够在各种生态系统开展模拟评 |
输入参数较多且代码不公开,模型矫正困难;模拟精度受输入参数准确程度影响较大;模拟结果及其模拟尺度受环境整体条件影响 |
CENTURY |
能够较好地预测地上净初级生产力的变化;操作方便、输入参数易获取易修改、模型开源 |
模拟主要基于点区域,以“均一性”来看待区域物种,区域模拟能力欠 |
CASA |
所需参数少且误差 |
模型反演在遥感影像选择上存在局限;模型参数中未考虑人类活动,忽略人类活动对植被的影 |
EPIC |
可模拟N、P等土壤营养元素变化来反应养分利用和损失情况;能够对不同管理措施下土壤水分动态、生物量累计以及作物生长过程进行模拟;在农业旱灾风险模糊评估方法中置信水平 |
模块参考少,田间管理类型缺乏,与现实管理条件存在偏差;研究尺度小以均一的小区域为主;对极端气候事件敏感性 |
Biome-BGC |
不考虑各种扰动情况下对植被NPP估算效果较 |
基于站点模拟对区域环境差异考虑不足;参数和模块不足,对植物种类复杂的生态系统模拟效果不理 |
Roth C |
参数简单且易获取;一定条件下模拟效果较好;能够模拟不同管理条件下各腐解阶段的有机碳残留率;可以很好地应用于陆地生态系统碳循环的相关研 |
结构过于简单;单考虑土壤中有机碳变化过程,忽略了植物生长过程和地上植物归还到土壤中的有机碳量;与CENTURY类似不能反映土壤碳饱和增长的实际情况,对有机碳含量较高的土壤模拟效果较 |
通过对比分析各个模型的优点和缺点(
自DNDC模型研发以来,世界各地科研人员为模型的发展做出了重要贡献,不仅丰富了模型的研究过程方法、优化了模型的参数设置、拓展模型的应用领域,而且还推动了模型功能的研发。随着DNDC模型在国内的应用,一些研究者逐步对模型进行了改进,使DNDC模型更适用于中国农业生态系
研究者(文献)Researcher name | 改进 Improvement |
---|---|
Zhang | 在DNDC原有模型的基础上添加了土壤气候与水热通量、植物生理参数、分解与硝化3个模块,使模型具备追踪植物生长过程中碳氮以及水分流动情况的能力,添加模块后的模型被命名为crop-DNDC。 |
Li | 对DNDC进行了修改,提高了其预测水稻生态系统温室气体排放的能力,修改的内容主要集中在厌氧生物地球化学、水稻生长模拟以及水稻管理参数优化,并测试了新模型对管理替代方案和自然条件变化(包括天气和土壤特性)的敏感性。 |
Li | 将DNDC模型的稻田土壤特性和管理因素与GIS数据库结合,根据1990年的气候和管理条件,设置2种水管理情景来模拟中国稻田土壤固碳、净CO2排放以及CH4和N2O的排放。DNDC模型9.3版本通过改进土壤蒸发的计算方式,提高了该模块的模拟精度。 |
Zhao |
利用黄浦江流域的典型稻田3年的实测数据对DNDC模型进行了校准和验证,完善了水文动态模块和植物生长模块,经过优化后的模型更新到DNDC模型9.5版,该版本强化了作物生长模块,优化了温室气体排放参数,使模型对农田作物生长期间温室气体排放模拟更加可靠。同时,研究者对作物参数进行了修正,DNDC模型新版本增加了适合中国水稻种植特点的移栽日期设 |
蒋在 | 开发出了CHINA-DNDC模型,该模型在DNDC原模型的理论结构和预测过程基础上,对模型的科学核心部分进行了重新编写,优化了模型结构,简化了原模型操作,提高了数据共享能力,设计了3种数据存储体系补充了相关系数,使CHINA-DNDC的功能得到扩展。 |
DNDC模型能够准确模拟田块和区域尺度SOC储量和固碳速率,有助于明确土壤固碳潜力、制定固碳减排措施,对维护生态系统稳定性和农业生产力具有重要意
受研究区域大小不同的影响,研究者在进行土壤碳库模拟研究中采用的比例尺度有很大不同。国家尺度模拟中DNDC模型所采用的土壤属性数据大多来自于1∶1 400万土壤图和《中国土种志》,区域尺度模拟中一般也是土壤信息相对比较粗糙的省级土种志资
采用栅格单元模拟不同比例尺矢量图斑单元及其转换生成的不同分辨率的栅格单元,能够对区域尺度土壤碳库模拟精度产生影响。倪元龙
研究表明,将充分考虑基于过程的DNDC模型模拟结果与通过实地仪器测量结果进行对比,经过模块优化和参数本地化的DNDC模型不仅能够有效地追踪或捕获稻田在整个生长期内的CH4和CO2排放模式,而且还能应用于区域尺
许多学者结合地面数据和遥感数据,利用遥感图像解译和实地验证,促进DNDC模型点位尺度外推。帅艳
土壤数据的详细程度是保证地球生物化学模型模拟精度的重要因子,在利用栅格数据进行计算机模拟估算农田温室气体排放中,选择适宜的模拟单元非常重
DNDC模型不仅可以用来评估稻田水肥管理、土地利用方式及土壤特性对稻田生态系统碳动态变化的影响,而且有助于判断在何时何地实施新措施会获得最佳效果,在预测生态系统变动方面具有可实施
孙园园
DNDC模型对不同灌溉模式和不同水文年条件下的稻田SOC具有较好的模拟效
耕作施肥制度和生态环境条件能够影响SOC储量,施用绿肥和化肥、少耕+30%秸秆还田均能增加SOC储
DNDC模型能够根据稻田管理模式的改变,构建出相应的农业数据库用以模拟不同管理模式下CH4的排放情况,验证其模式的实用价值和助推新管理模式的施行。而且,该模型能够针对不同土地耕作制度、灌溉模式及施肥条件等,较好的模拟出SOC的变化规律,从而预测稻田生态系统SOC变动趋势,有助于不同地区更好地选择和设计适宜当地水稻农业可持续发展的模式。
敏感性分析可以确定影响模拟结果的关键模型参数,减少模型参数的不确定性,提升模型模拟精
模型点位模拟结果与实测数据具有较高的拟合度,这是判断模型适用性的前提条
大部分DNDC模型的应用目前还是处于单方面的点位尺度模拟或区域尺度模拟,而从点位尺度验证到区位尺度模拟研究,估算误差较大。土壤属性空间异质性是SOC动态变化、碳储量、温室气体估算不确定最主要的来
虽然DNDC模型能够较好地用于中国稻田生态系统模拟,但由于DNDC模型提供的作物生理及物候学参数主要来自北美的观测,不能完全适应中国土地的复杂性,模型在应用时需进行验证,确认DNDC模型适用于模拟的区域。国内外种植模式和耕作措施存在差异,DNDC模型缺乏一些中国特有且复杂的农业耕作特征。
DNDC模型虽经过不同领域的研究工作者数十年来的改进,能够用于草地、森林、湿地等生态系统碳氮循环的模拟。但随着农业技术的革新,如水稻移栽、复杂多种作物系统以及农田管理过程中不断出现的新技术,使我国的农田管理措施得到很大的改进,模型拥有的模块很大程度上已经不能满足当前的实际情况,包括模型对中国主要农业生产区温室气体的精细研究还有待进一步发
任万
DNDC模型需要大量的参数支撑,而且所使用的参数受气候因子和环境整体条件影响较大,因此利用DNDC模型对不同区域稻田生态系统开展研究时,需要根据区域条件对模型的参数进行修改。目前对于模型模拟结果进行矫正的方法有试错法、贝叶斯推断法2种。但是,由于存在输入参数较多,找准矫正参数困难和代码不公开等问题,使得模型校正难度增加,限制了模型准确
利用长期点位试验的结果,对DNDC模型当中的参数进行本土化校正,采用RMSE、MAE、相对误差(E)和相关系数(R)这4种统计学参数,能够验证DNDC模型在稻田生态系统碳动态变化和温室气体估算的适用性。此外,区域尺度模拟将DNDC区域模拟的最小单元划分到乡(镇)的同一土壤类型,能够减少空间异质
总之,DNDC模型在模拟和估算稻田生态系统碳动态变化等方面,能够达到非常满意的精度和可靠性,适用于中国稻田生态系统模拟。但DNDC模型也会由于地区环境条件差异、管理条件不同而导致模型模拟结果出现偏差。因此,DNDC模型也在不断的开发改进,如将模型从单机版推向网络版,进一步拓展模型的模块功能,使之更好地服务于研究活
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