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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=61" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">植物照明领域DLA与DLI有什么区别 </h1> <p class="xg1"> 时间：2017-5-18 14:36<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1861)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=5701&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=61" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>在植物灯的问题中，提的最多的问题是什么光谱？多少PPFD？</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div> 在植物灯的问题中，提的最多的问题是什么光谱？多少PPFD？</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201705/18/143530lpzqhouttwpbazba.jpg" target="_blank"><img src="data/attachment/portal/201705/18/143530lpzqhouttwpbazba.jpg"></a></p></div><div><br></div><div> 如果不提供种植品种与环境条件，其实这个问题是无法准确回答的，植物种植是光辐射能的转换过程，光辐射能在这个转换过程遵循能量守恒定律，对于某一品种的植物，首先要确定植物每天需要的光辐射能量，否则，一系列参数的计算就没有依据。</div><div><br></div><div><b><font color="#f00000"> 什么是DLI？</font></b></div><div><br></div><div> DLI（Daily light integral）日光积分量</div><div><br></div><div> 指太阳光有效辐射（PAR）下每天每平方米的光辐射能的积分量，单位：mol／m2d。</div><div><br></div><div> DLI在农业种植中是一个重要光合量参数，是农业种植科学研究的主要参数，具有普遍的种植指导意义，在太阳光下，由于太阳光的光合辐照度（换算成PPFD）随时间与天气状况在不断变化，这个变化甚至会在低于补偿点和高于饱和点之间波动，所以，DLI需要按照积分的方法计算，初略的计算可以用平均PPFD与有效时间（小时）进行计算。</div><div><br></div><div> 在太阳光下按照平均值方法计算DLI的计算式：</div><div><br></div><div> DLI＝0．0036＊PPFD（平均）＊有效时间。有效时间单位：小时。</div><div><br></div><div> PPFD<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>值与有效时间需要根据补偿点与饱和点进行相应的调整。所以DLI值每天波动比较大，需要数据回归方法才能确定。</div><div><b><font color="#f00000"><br></font></b></div><div><b><font color="#f00000"> 什么是DLA？</font></b></div><div><br></div><div> DLA（Daily light amount）日光合量</div><div><br></div><div> 指人造光源在光周期下每天每平方米的PPFD所产生的光子的摩尔数量，单位：mol／m2d。</div><div><br></div><div> 声明：DLA参数由好亮固体光源研究所许东定义，引用需要注明来源。</div><div><br></div><div> 由于植物灯的光量在光周期下是恒定的，DLA的计算式：</div><div><br></div><div> DLA＝0．0036＊PPFD＊PP。PP——光周期（小时）</div><div><br></div><div> DLA是依据植物品种与种植环境综合计算得出，不同植物的DLA不同。</div><div><br></div><div> DLA是植物工厂与温室补光的种植<a href="http://optics.oecr.com" target="_blank" class="relatedlink">工艺</a>的主要参数，是植物灯设计的主要依据，DLA可以通过实验数据或者通过DLI经过加权后初步得出，需要实验数据修正，下面是两个植物品种的DLA数值供参考：</div><div><br></div><div> 生菜DLA：9——11。</div><div><br></div><div> 番茄DLA：16——20。</div><div><br></div><div><b><font color="#f00000"> DLA与DLI的区别</font></b></div><div><br></div><div> DLA与DLI的计算公式相近，单位相同，但计算量的选取方法不同。</div><div><br></div><div> DLA是为植物品种设定，DLI是某一区域太阳光的辐射量。</div><div><br></div><div> DLA是确定的量值，DLI有随机性，DLI只能够用平均值表示。</div><div><br></div><div> DLI只能够应用在大田和温室大棚，不能够用在室内，DLA具有植物属性，可以应用在大田、温室、室内的植物种植。</div><div><br></div><div> DLA是种植工艺的主要参数，用于定量分析，DLI是辅助参数，用于定性分析。</div><div><br></div><div> 植物工厂的光辐射参数如果没有依据DLA计算，会产生不确定性的结果。</div><div><br></div><div> DLA确定了人工环境下光辐射的能量消耗，由这个参数可以计算出种植成本。</div><div><br></div><div> 在温室大棚里，室内的DLI小于室外的DLI，温室的DLI通常小于许多植物品种的DLA，当室内DLI小于DLA，则需要补光，补光量是DLA——DLI，当室内DLI大于DLA，就不用补光。</div><div><br></div><div> DLA参数的创立，科学的提供了温室是否补光与补光量大小的<a href="http://theory.oecr.com" target="_blank" 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